yes, bring the receipt and the box (here I think you can get the serial number of your phone)of the phone to the police nearby your house and they will make report and they will work with Q-Tel to catch the bad guy. If he is stupid enough to use it here in Doha, I am sure Q-Tel and Police can track your phone. And the Police will contact you once the bad guy got cought. Please do this. As I know from my personal experience this two Authorities are working together in the similiar cases.