I respectfully request that your offices provide me with competent evidence that I have any legal obligation to pay you. Credit") in favor of the Village of Itasca as beneficiary (hereinafter.All applicants and individuals must sign and complete the credit application. Filled out completely. A debt validation letter is a written communication that a consumer sends to a debt collector or creditor to request verification and validation of a debt. Below is a sample letter to help you craft your own letter. Send the letter via certified mail and keep the return receipt for your records. The Illinois Department of Revenue (IDOR) sends letters and notices to request additional information and support for information you report on your tax return. (A) Letter of credit format. The following are basic rules for proper and safe notarization: 1) Keep your notary seal in a safe place; 2) Do not notarize a signature unless the signer.