Reward for the person who can help me fixing a phone

hello to the mercyful persons out there ,i have a n915t that i purchase on ebay , i purchased this phone and took it overseas , i inserted my simcard ,turned the phone on and i had no signal just a message displaying . No registered on Network . , i started looking to all the settings everything was correct till i realize imei doesnt match the one behind the phone , i offer $ to the person who can fix this , sorry if imnot in the right place i need help , im overseas and cannot send the phone back