Are you looking to write an effective complaint letter? It's helpful to explain the problem and say how you want the company to resolve it.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. Find out how to craft a formal complaint letter. Learn about key components, structure, and tips for an effective complaint. Be clear and concise. Describe the item or service you bought and the problem. To file a consumer complaint, complete the Office of Inspections - Consumer Affairs Complaint Form, or call 732-398-2300 for a form to be sent to you.