Dear City of Austin, Fiscal Surety Office: We,. This letter will confirm that I am a victim of identity theft.See a sample credit dispute letter below. 1. In the sample letter, fill in your personal information. This e-book provides templates for 21 most effective credit and collection letters that will help you communicate better with your customer. 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. If you're a victim of identity theft, you can use an affidavit of identity form to prove who you are. In the opening paragraph, clearly state your request for debt validation. Use formal language and be specific about what you are requesting. Please send me a copy of my credit report.