Someone else help me here:
IMO
First - contact First Premier and see if you can settle the debt with them. If they still own it, see if they will do a PFD.
Second - if they don't own it, they will give you the info of who does. Contact the new owner and do a PFD with them, by mail - CMRRR. If again, they don't own it, they'll direct you to who does.
If the latest CA gets frisky, send them a DV. It will stop the calls and the legal paperwork if they're threatening a judgement, at least until they reply. If one and two above are a bust, then maybe the last CA really does own it. In that case, do a PFD with them.
This is the course of action that I'm doing now with my DH CR. I avoid CA's at all costs.
11/14/07 TU 567 - EQ 561 - EX 577
11/29/07 TU ??? - EQ 573 - EX ???
12/10/07 TU ??? - EQ 579 - EX ??? - 60% util - OOPS!