State Bank Of India [SBI] — fraud and misuse of atm card

I am from kangra, himachal pradesh, but currently i lives in kharar and my atm card is from sbi bhatoli branch, kangra, himachal pradesh. As i go to the atm in kharar for withdrawing money. A boy is standing there with me and atm machine is not working properly so he trying to help me and there he just exchange my card and then many of the boys came there suddenly. I couldn't have my phone with me as soon as i came home i receive a message that they have withdrawn all my money then i got to know that they exchanged my card. Please help me