Yeah, they do that. Hate those guys, and yes, they want you to have their credit card or YOUR bank account. I put up a thread on the bad sellers (I think) when this happened to me.
My suggestion is:
1) ask if you can pay by check or MO. I figure a $.50 cent money order (my cost) is worth screwing PP out of $5. (Kharma is tenfold rule).
2) "lose " your credit card, call it in lost or stolen, and within next day service a new one arrives at no cost to you. For real, or just call it in lost and cut it to pieces and deep six the pieces once your new one with a new number arrives. New credit card number means new limit , shop away with the new one until you have to "lose" that one.