This isn't the standard procedure, but you should still be fine. Call the OC and tell them they need to stop having the CA try to collect since there is no amount due. Dispute the CA's at 'not mine'. If this does not work, DV them. You can DV them today, next week, or not at all... all personal choice.
You can take this further if it does not work, but it should... and there's no reason to make it more complex. G'luck.

EQ 787 EX 781 TU 737 11/17/07
*** I am not an attorney. If I was, I might not clip coupons. If you want legal advice, consult an attorney. If you want my personal opinion, feel free to consider my posts***