I called to cancel my service in July, 2009. I was pre-paid through October, so the service was to be terminated on the last of the pre-paid date. After that date, they charged my MC the next 3 months without my authorization. I complained to my Master Card bank and they credited my account. Since then I've received continuous bills from XM and multiple calls from a collection agency despite four phone calls over eight months to XM. The XM representative told me each time I called my account was closed and I had no balance due. The latest... read full review »