Complaint #1: When my first XM plan expired, the credit card I used was billed without my consent or knowledge. Complaint #2: When I cancelled the plan for a vehicle I no longer owned, XM never refunded the pre-paid amount. Instead, XM did cancel the service for the second vehicle on the plan which was also pre-paid, never refunding that amount. Complaint #3: When I called several times to resolve the issue, I am told either "there's nothing we can do" or "you were sent a refund" but no further information such as when the refund was allegedly sent or a check number or any credit card refund data. read full review »