Last year when my subscription was about to cancel, I played hard to get with Sirius. I told them I was going to cancel so they offered me a deal. I didn't pay with a credit card because I heard they keep billing you when the year is up. So I paid with a check, and now they're sending me bills. I'm not re-upping my subscriptions. Can I ignore these bills, or am I in some type of Sirius shady contract that will effect my credit because of lack of payment?