Yes without your pin-code no one can withdrawl money by using your ATM card. How he or she knows your pin number? if you have kept your pin number with your ATM card then this is your mistake. ( some people use to write and keep pin number on ATM card itself which is a big mistake. ) anyhow you can complain to police about this matter also. all the ATM'S is Qatar having a camera, and I think police and trace the person who used your card.