How to Write a Complaint Letter to a Company

October 28, 2026 · 4 min read

Learn how to write a complaint letter to a company, including the exact details to include, key deadlines, and how to get a fast resolution.

Learning how to write a complaint letter to a company starts with gathering your purchase records and clearly explaining what went wrong. In your letter, state the problem simply, specify the exact outcome you want, and give the business a fair deadline to reply. Putting your concerns in writing creates an official record of the issue if initial phone calls or emails have not resolved it.

Please note: This article provides general consumer information and does not constitute formal legal or financial advice.

Steps to write a complaint letter to a company

According to the Federal Trade Commission (FTC) Consumer Advice, you should generally start by contacting a representative of the company by phone or email. If reaching out that way does not fix the problem, drafting a formal written complaint establishes a clear record of what you reported. Follow these steps to build your letter:

List your essential information: Begin your letter with your full contact information, your account number or transaction number, and the specific details about the product or service you purchased. As noted in the FTC guide on sample customer complaint letters, you should also include the date and location of your purchase.
Summarize the problem: Provide a brief, factual explanation of the issue. Outline the basic facts of what happened and describe any previous steps you already took with customer service to address it.
Set a clear, polite tone: Keep your writing straightforward, calm, and nonthreatening. A clear and professional message makes it easier for the person reading it to understand the facts and take action.
Request a specific outcome: State plainly what resolution you expect. For example, explain whether you want a full refund, a repair, a replacement exchange, or store credit.
Provide a reasonable reply date: Ask the business to respond by a specific, fair date so that both sides have a shared timeline for addressing the issue.
Attach supporting paperwork: Include copies of any receipts, warranties, work orders, or earlier messages related to the issue. Never send your original documents; keep the originals and a copy of your completed letter safely in your own files.

Sending your letter and protecting your payment

How you deliver your complaint is just as important as what you write. If you send a physical paper letter, using certified mail with a return receipt gives you official proof of delivery and shows who signed for the envelope. If you submit your complaint through an online portal or web form, always save or print a copy of the completed text before you press submit.

If your issue involves an incorrect or unauthorized credit- or debit-card charge, a letter to the seller may not be enough. The FTC explains in its advice on disputing credit and debit card charges that you must also notify your card issuer within 60 calendar days of the first statement showing that charge. Be sure to send your notice to the card company’s designated billing-dispute address, which is often different from the regular address where you send monthly payments.

What to do if the company does not resolve the issue

If the business fails to reply or refuses to correct the situation, you still have options for outside assistance:

State consumer agencies: The official portal at USAGov provides directories of state consumer protection offices that assist consumers with unresolved business complaints.
Federal fraud reporting: You can submit reports to the FTC. While federal fraud reports help law enforcement agencies detect broader patterns of wrongdoing, the FTC does not resolve individual consumer complaints.
Financial issues: If your complaint involves a consumer financial product or service, you can submit it to the Consumer Financial Protection Bureau. Under the Consumer Financial Protection Bureau (CFPB) process, companies generally respond within 15 days and may take up to 60 days to provide a final response, after which you have 60 days to provide feedback. Remember that this timeline applies specifically to the CFPB complaint program rather than serving as a standard deadline for private company letters.

The fast way: let Danilli do it

Danilli is an AI app made in Miami, for everyone. If you want to skip drafting your complaint from scratch, you can let Danilli handle the writing for you in just a few straightforward steps:

Visit danilli.ai.
Tell Danilli what happened with your transaction or service.
Danilli writes a firm, polite complaint letter for your situation.
Choose whether to make it a Word or PDF file so it is ready to save, print, or send.

Quick answers

How long should I give a company to reply to my complaint?

You should specify a reasonable date in your letter, giving the company adequate time to review your records and reply.

Should I mail my original receipts to the business?

No, you should only send copies of your receipts, warranties, and work orders, while keeping all original documents and a copy of the letter for your personal records.

What should I do if my complaint is about a card charge?

You must notify your card issuer in writing at its specific billing-dispute address within 60 calendar days of the first statement showing the charge, rather than relying solely on your letter to the seller.

Sources

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Written with Danilli's AI from the sources listed above, then published automatically. General information, not professional advice: check the sources for details.