I purchased the Motorola Q9C from an Ebay seller with great reviews and now Sprint tells me I can't activate it because they don't have the serial number registered. So I called Motorola and they don't have it registered either and suggested I return it. So my question is, if the seller doesn't repond to my question and doesn't accept returns, what should I do with this phone? Is there a way to find out if it was stolen?