I should have made a further edit to my message... It should have made a point about it being likely that no one in the house placed the PPV order while still (extremely) unlikely that it was because of a cloned card. A billing error at DishNetwork would be very probable. They could have easily had some system bug or just cross-billed from someone else's account. Very easily.

They should refuse to pay on the threat of dropping service completely. They're not the phone company. There are other choices. DirecTV would be more than happy to come over and install a system. You can use the same dish in fact and need only to re-point it and connect a new receiver. The benefits there: Better customer service, better user-experience with hardware/software, more/better programming (IMO), better video quality (IMO).

Bruno