Here's how my experience went. Debt collectors started calling and sending letters. I sent my verification letter, certified mail, kept the receipt. I told them in the letter they had 30 days to provide me with the proper documents.
So after the 30 I got a letter from a lawyer representing them. I simply sent the lawyer a copy of the letter I sent and a copy of the certified mail receipt.
A few weeks later I got a letter from another lawyer that said the first lawyer no longer represents the company in this matter.
I simply sent them a copy of the letter and receipt and also included in my letter to the lawyer that simply by them contacting me the company was in violation of the Fair Debt Collection Practices Act, which states that once verification is requested, all collection attempts must cease until such verification is provided.
My letters were piff too breh.
I remember it saying something like "I would have preferred not to go the legal root but your client's incessant harassment..."
They fell back.
Oh yeah I forgot to mention that your original letter should also request proof of item removal from your credit reports if the verification is not satisfied.
There's a website that lists law firms who specifically sue debt collectors over this. From what I understand these sharks are
terrified of these lawyers and they'll take your case for free because it's a guaranteed win.