The debt validation is the beginning of eliminating the account. Some say “a debt is a debt is a debt” and pay up. However, if the “owner” who has purchased the alleged account in a portfolio is junk debt and worthless – PROVE IT. The law says to prove it. If major corporations cook the books in accounting, then what makes you think that collection agencies would not create fake documentation to look legitimate. It happens all the time. Collection agencies can and do operate as a business. That is not unusual. They also operate as fake attorneys offices. Unless you are aware of these facts, you are helpless. You must write the agency and ask for proof. Letters from debt collectors are not to be ignored.
It is imperative to document all action for your records. This basically states “do not contact me until you can send valid documents”.