Here's a sample to help you write a complaint letter about a product or service. First, choose the consumer complaint form that fits your problem.Consumer Action offers a sample complaint letter and an email complaint template. You can cut and paste these documents below. First of all, you should write your complaint in details, and in good language. Take a look at this example complaint letter for ideas on how you should approach writing a letter of complaint. You may complete the online form and an Ombudsman can assist you with completing the US Department of Health and Human Services required forms. Name of the person you are writing to. Be clear and concise. Describe the item or service you bought and the problem.