Debit Card

i just went to the ATM and withdraw Rs-2000 only .I don't know that happened because the ATM never give me the money but the transaction slip that i got show that the money has been detected ....I don't know if i will ever get my money back ...
what i do ?

i was use pnb atm facility to pay the petrol bill in the process the money got detected from my account but transaction was is faild ....
kindly refund my money