debt validation letter 3
https://page-wiki.win/index.php/How_to_Build_Business_Credit:_A_Practical_Guide_for_Entrepreneurs
A debt validation letter is your first move when a collector contacts you about a debt you're not sure you owe. You send it within 30 days of their initial notice, asking them to prove the amount is correct and that they have the right to collect. It buys you time and forces them to show their paperwork.