Have you recently settled a debt and are searching for a paid in full letter? Good news, we've got two free sample form letters below.What information should be included in my paidinfull letter? Find out whether your creditor must accept less than what you owe if you write "paid in full" on your check. Note that any taxes, interest or penalties should be totaled into one sum. If you ever need to prove that a debt is fully paid and can no longer be collected, then a paidinfull letter can be your best friend. Since 2002 PIF has focused on building lasting client partnerships and has become one of the most effective collection agencies in Arizona. We are Phoenix's large commercial claims experts. You can fill in the appropriate information and mail this to the debt collection agency harassing you. Sample Cease and Desist Letter: Insert date.