The short answer
To write a complaint letter, address it to the company’s customer service or complaint department, identify the purchase (date, store, order or receipt number), explain what went wrong in a few factual sentences, state exactly what you want (refund, repair, or replacement), and give a reasonable deadline to respond. Enclose copies, never originals, of your receipt and other records. USA.gov advises contacting the company first before you seek help elsewhere, so mail the letter in a way you can prove, such as Certified Mail, and keep a copy for any later complaint to a state attorney general, the FTC, or the CFPB.
What is a complaint letter?
A complaint letter, also called a letter of complaint, is a short written message to a business that explains a problem with a product or service and asks for a specific fix. A consumer complaint letter is the same thing written by a customer: a defective appliance, a repair that wasn’t done, a duplicate charge, or a service that never showed up.
USA.gov lists a “formal complaint letter” as one of the ways to explain your problem to a company, alongside calling or web chatting, and publishes a sample complaint letter to help you explain the problem and what you want done to resolve it. A letter does something a phone call can’t: it puts the facts, the request, and the date on paper, so you have a record if you later need to escalate.
This article is general information, not legal advice. Consumer rights depend on your state and on the product, so for a specific dispute, check your state consumer protection office (USA.gov lists them by state) or find free or low-cost legal help through USA.gov.
When should you write a complaint letter?
Write it after a quick first attempt to fix the problem informally has failed, and before you go to a government agency, a credit card dispute, or court. USA.gov’s advice is to “contact them first before you seek help elsewhere,” and the CFPB asks the same question before you file with it: “Have you tried reaching out to the company?”
Don’t wait long. Some deadlines run from the purchase or the bill, not from when you get frustrated. If you paid by credit card and the problem is a billing error, the federal deadline for a written notice is 60 days (see below), and your complaint letter to the seller doesn’t replace that notice.
- The product is defective, damaged, or not as described, and the store or seller didn’t fix it when you asked.
- A service was not performed, was performed badly, or cost more than agreed.
- You were promised a refund or credit that never arrived.
- A customer service representative couldn’t help, and you want to take it to management in writing, as USA.gov suggests.
Who should you address a complaint letter to?
Send it to the part of the company that can actually fix the problem. USA.gov says to send your complaint to a salesperson or customer service representative and to look for the company’s contact information on its website under links that say “contact us,” “customer service,” “about us,” or “privacy statement.” If that doesn’t work, it says to take your complaint to the company’s management.
Many companies list a mailing address for customer relations or consumer affairs. Use that address rather than a payment address or a store you happened to visit. Address the letter to a named person or title when you can find one, and keep a note of where you found the address and when.
| Situation | Send the letter to | Source |
|---|---|---|
| Problem with a product or service | The company’s customer service contact, then management if they don’t help | USA.gov |
| Credit card billing error | The card issuer at “the address given for billing inquiries, not the address for sending your payments” | FTC Consumer Advice |
| Credit report error | First dispute directly with the credit or consumer reporting agency | CFPB complaint page |
| Seller outside the U.S. (online purchase) | The seller, then econsumer.gov | USA.gov |
What should a complaint letter include?
Keep it to one page if you can. Before you write, gather your records; USA.gov lists sales receipts, warranties, contracts, work orders, and email messages or records of any contact you’ve had with the seller. The FTC’s advice for billing disputes applies to any complaint letter: include copies, not originals, of the documents that support your position, and keep a copy of your letter.
| Element | What to write | Why it matters |
|---|---|---|
| Your name, address, and phone or email | Where the company can reach you | So they can respond and send a refund |
| Date | The date you mail the letter | Starts the clock on your deadline |
| Company name and complaint address | Customer relations or management address from the company’s website | Gets the letter to someone who can act |
| Purchase details | Product or service, date and place of purchase, order or receipt number, amount paid; last four digits of a card or account number only if needed | Lets them find the transaction |
| What went wrong | Two to four factual sentences, with dates of earlier contacts | Shows the problem and that you tried |
| What you want | Refund, repair, replacement, or credit, with a dollar amount | A specific request is easier to grant |
| Deadline | A reasonable date, such as 14 days out | Sets a point when you’ll escalate |
| Enclosures | List the copies included (receipt, warranty, photos) | Points to your evidence |
Sample complaint letter: what does a consumer complaint letter look like?
Here’s a short sample complaint letter about a defective appliance. The names, addresses, phone number, and amounts are fictional. Replace them with your own facts and keep the same order: purchase, problem, request, deadline.
- Heading: Priya Shah, 412 Birch Street, Columbus, OH 43215, (614) 555-0147
- Date: October 18, 2026
- Inside address: Customer Relations Department, Brightline Home Appliances, Inc., 900 Commerce Drive, Dayton, OH 45402
- Re: Defective Brightline 12-cup coffee maker, Model BL-120, order no. 58213
- Salutation: Dear Customer Relations Manager:
- Body, paragraph 1: On September 6, 2026, I bought a Brightline 12-cup coffee maker, Model BL-120, from your online store for $89.99 (order no. 58213). It arrived on September 10.
- Body, paragraph 2: On September 27, the heating plate stopped working and the unit now shuts off after one minute. I called customer service on September 29 and October 6 and was told a replacement would be sent, but nothing has arrived and I haven’t received a case number.
- Body, paragraph 3: Please refund the full $89.99 to my original payment method, or send a working replacement with a prepaid return label for the defective unit. I’d appreciate a written response by November 1, 2026. If the problem isn’t resolved by then, I plan to file a complaint with the Ohio Attorney General’s consumer protection section.
- Closing: Sincerely,
- Signature and typed name: (signature) Priya Shah
- Enclosures: Copy of order confirmation dated September 6, 2026; copy of delivery confirmation; photo of the unit showing the error light
How do you write a complaint letter that gets a response?
Be clear, short, and polite. The CFPB’s advice for its own complaint form works for a letter too: “Be clear and concise about the problem you’re having,” and “Include only the most important dates, amounts, and communications you’ve had with the company.”
- Lead with the request. The reader should know in the first paragraph what you bought and in the third what you want.
- Stick to facts you can prove. Dates, amounts, model numbers, and names of people you spoke with are more persuasive than adjectives.
- Leave out insults, sarcasm, and threats you don’t intend to carry out. Naming a real next step, such as a complaint to your state attorney general, is enough.
- Ask for one remedy, or two clear alternatives. A vague “make this right” is easy to ignore.
- Sign it, keep a copy of exactly what you sent, and note the date you mailed it.
How should you send a complaint letter so you can prove it?
Send it in a way that creates a record. USPS DMM 503 says Certified Mail “provides the sender with a mailing receipt and, upon request, electronic verification that an article was delivered or that a delivery attempt was made.” A return receipt adds evidence of delivery: DMM 503 says it provides “evidence of delivery (to whom the mail was delivered and date of delivery).” For credit card billing disputes, the FTC says that sending your letter certified mail with a return receipt “gives you proof of what the issuer got.”
At the Post Office, Certified Mail costs $5.55 on top of postage, and a 1-ounce stamped First-Class letter is $0.82, according to USPS Notice 123 (letter and extra-service prices effective July 12, 2026; unchanged in the notice effective October 4, 2026). A return receipt adds $2.91 electronic or $4.65 for a hardcopy PS Form 3811.
| Item | Price | What you get |
|---|---|---|
| First-Class Mail stamped letter, 1 oz | $0.82 | Postage |
| Certified Mail fee | $5.55 | Mailing receipt and delivery record |
| Return Receipt, electronic | $2.91 | Electronic delivery record with signature |
| Return Receipt, hardcopy (PS Form 3811) | $4.65 | Mailed green card |
Example: how Priya mails a complaint letter with IRIS
Priya, the fictional customer in the sample above, writes her complaint letter as a one-page PDF and adds a second page with copies of her order confirmation and a photo of the error light. She wants a record that the letter reached Brightline’s customer relations address, so she chooses Certified Mail with an Electronic Return Receipt.
- She finds Brightline’s customer relations mailing address on the company’s website and notes where she found it.
- She saves the letter and the copies of her records as a two-page, US Letter-size PDF. It shows only the order number, with no card number, and she keeps the original receipt at home.
- She uploads the PDF to IRIS, enters her address as the sender and Brightline’s customer relations address as the recipient, and selects Certified Mail and Electronic Return Receipt.
- She reviews the document, both addresses, the options, and the total before paying.
- IRIS prints the letter and mails it by USPS First-Class Mail with Certified Mail. Her private order page shows the USPS tracking number and provider-reported events when received.
- She saves her own copy of the exact PDF she sent and marks November 1, 2026, on her calendar.
| Line item | Price |
|---|---|
| Base (service and First-Class postage) | $3.00 |
| 2 black-and-white pages at $0.20 | $0.40 |
| Certified Mail | $6.95 |
| Electronic Return Receipt (optional) | $2.91 |
| Total | $13.26 |
What if the company doesn’t respond to your complaint letter?
If your deadline passes without a fix, escalate to an official channel and attach or describe your letter and proof of mailing. USA.gov says that if the seller doesn’t resolve the issue, “a government office, a consumer organization, or the legal system may be able to help.”
If you paid by credit card, you may also have rights under the Fair Credit Billing Act. For billing errors, such as being charged for things “you didn’t accept or weren’t delivered as agreed,” the FTC says to write to the issuer at the billing-inquiries address and to send your letter “so that it reaches the issuer within 60 days after the first bill with the error was sent to you.” The statute, 15 U.S.C. § 1666, applies when the creditor receives the notice “within sixty days after having transmitted to an obligor a statement” containing the error. For a problem with the quality of something you bought, the FTC says you can withhold payment and ask the issuer to investigate if the goods or services cost more than $50, you bought them in your home state or within 100 miles of your current billing address, and you tried to resolve the dispute with the seller first.
| Problem | Where to go | What the source says |
|---|---|---|
| Any business problem not resolved | Your state attorney general or consumer protection office | USA.gov: they “can help with complaints against businesses, investigating scams and fraud, and more” |
| Scams, fraud, or problems with a credit card purchase | FTC at ReportFraud.ftc.gov | FTC: if contacting the seller and issuer don’t work, “report it to the FTC” |
| Bank accounts, credit cards, debt collection, loans, credit reports | CFPB complaint portal | CFPB: “Most companies respond within 15 days” |
| Credit card billing error | Written notice to the card issuer’s billing-inquiries address | Must reach the issuer within 60 days after the first bill with the error (FTC; 15 U.S.C. § 1666) |
| Online purchase from a seller outside the U.S. | econsumer.gov | USA.gov |
Can you mail a complaint letter online?
Yes. IRIS Postal Forms is an independent print-and-mail service, not USPS, a court, or any government agency. You upload your own finished US Letter-size PDF, or start from the IRIS refund request letter template, which helps you describe the purchase or charge, the reason for the request, and the amount you want the business to refund. You enter the sender and recipient addresses and review the document, addresses, options, and total before paying. IRIS prints the letter and mails it by USPS First-Class Mail to US addresses only.
A one-page black-and-white letter is $3.20 and a two-page letter is $3.40. Certified Mail adds $6.95 (one page, $10.15; two pages, $10.35), and the private order page shows the USPS tracking number and provider-reported events when received. An Electronic Return Receipt adds $2.91; IRIS doesn’t offer a hardcopy green card. If you’re in California and want to escalate, IRIS also has a page for the California Attorney General consumer complaint form: you download the official form, complete and sign it outside IRIS, and upload the finished PDF, when the agency’s filing method permits a printed PDF.
Know the limits. The order page isn’t a downloadable USPS postmarked mailing receipt or Return Receipt document, and order status isn’t proof of delivery by itself, so keep your own copy of exactly what you sent. IRIS can’t enclose physical items such as original receipts, checks, or photos, doesn’t guarantee delivery dates, and a printed PDF can’t supply a wet-ink handwritten signature. Don’t upload Social Security numbers, complete payment-card details, passwords, or highly sensitive medical records; if a company needs that information, send it through the company’s own secure channel or mail it yourself.
Sources & further reading
Product details checked against the IRIS API contract when this article was published. Platform references can change; consult the linked documentation when implementing.
- USA.gov: How to file a complaint about a company’s products or services
- USA.gov: State consumer protection offices
- FTC Consumer Advice: Using credit cards and disputing charges
- 15 U.S.C. § 1666: Correction of billing errors
- CFPB: Submit a complaint about a financial product or service
- FTC: ReportFraud.ftc.gov
- USPS Notice 123: Price List
- USPS DMM 503: Extra Services
Published by IRIS Postal Forms, operated by Great Lakes Computing Office LLC. Send a correction.