1. In the sample letter, fill in your personal information. Use this sample letter to dispute mistakes on your credit report.What should I include in a dispute letter? One way to fix an error on your credit report is to write a credit dispute letter and mail it to one or more credit bureaus. I respectfully request that your offices provide me with competent evidence that I have any legal obligation to pay you. Get your free copy here! (Must be on Financial Institution Letterhead). Fill in your information on the template letter and edit it as needed to fit your situation. 3. Print and mail the letter. This program will help you write a letter that formally requests the money you are owed.