debt verification and debt validation?

There is a subtle difference between a debt validation and a debt verification letter. In a debt validation letter,
In a debt validation letter, a debt collection agency validates the debt. They must prove with supporting documents that you owe this debt. The documents should include how much you owe, the name of the original creditor, the name of the debtor, the license no of the collection agency,

A debt validation letter is sent by a collection agency. A debt verification letter is sent by the consumer or debtor. In a debt verification letter, a consumer or debtor asks a collection agency to verify the debt.

The debtor has to send a debt verification letter within 30 days. If you (the debtor) don't take care of it within a month, the debt may be assumed to be valid again, and efforts to collect it may continue. The debt collector has to reply within five days. If they don't do that, it doesn't mean you don't owe the money, but you could sue the collection agency.