The company made over $300 in additional charges to my charge card. A representative could not tell me what these charges were for. I requested the charges be credited to my account and was told billing would contact me. That never happened. I have made numerous calls to XM, many of which resulted in disconnects. I cancelled my service but have been unable to get a refund of the overcharges. They also have a practice of switching the radio ID. I purchased a new vehicle and called to request the old radio be cancelled. I was told the new... read full review »