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Does the OC show a balance due? If at $0, then they sold the account to the CA. Your only option is with a GW. Ask them to remove any lates and to change any comment to "paid as agreed". However, take what you can get too. Any removal of lates can go a long way to improving your score.
Make sure you DV before offering a PFD, even if you know it is yours.
Most OCs will not delete!! The Ca owns the account so they might accept a PFD.
You should always send a DV CMRRR before thinking about a PFD!!!
What is the DOFD and are you past SOL. It is easier to get them to accept a PFD after you are past SOL.
File complaints with the BBB, your AG, their AG, and the FTC.
File them all at the same time, that way they get hit from both AG and the BBB at the same time.
Do I file complaints against the CRA's or the CA?