Sirius radio charging me illegally?

If you did not call to cancel the service, they will continue to bill you monthly on whatever credit card they have. They have no idea if you listen to it, broke the radio, etc., nor do they care. This is how they make money. Have it canceled if you are not using it. Be glad they credited three months to the card. In the meantime, dispute the charges through the credit card you have (call the credit care company or go online and ask them how to proceed). They will go to bat for you. You STILL have to cancel the service though or continue to be billed.