| I would think the first step would be to tell them (in writing; the appropriate address should be on one of their letters) that your aren't the debtor they're looking for. That should stop the contact (except perhaps for an acknowledgement letter) unless and until they think they can reestablish that it really is you they are after.
I wonder if you could have, on the first call, given them the last four of your SSN or some other info to help them realize it is someone else they want? I had this same thing happen once over 20 years ago and that was all it took. |