Samsung galaxy note 3 white tmobile for sale in Aurora, Maine

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$300

I have a Samsung galaxy note 3 white for sale. i purchased it a week back on Americanlisted for $385. Today phone stop working. I'll take it to T-MOBILE shop to inspect it out. They told me it has been reported lost or stolen. Now the phone has bad imei. I don't understand exactly what to do with it. , if somebody understand how to repair it.. or curious about buy it. Please let me understand asap.