If you’ve been contacted by debt collectors but don’t think you don’t have any debt you can send them a letter. In the letter, say that you don’t owe any or all of the money, or ask for verification of the debt.
If you send the letter within 30 days of getting the validation notice, the collector has to send you written verification of the debt, like a copy of a bill for the amount you owe, before it can start trying to collect the debt again. You also can get a collector to stop contacting you, at any time, by sending a letter by mail asking for contact to stop.