State Bank Of India [SBI] — money is debited automatically from my account

I tried to withdraw 500 rs from atm but could not get but debited for my account then i got atm withdrawal credited to my account 500 but again csh wdl debited 500. Where is my 500 rupees, plz tell me that what is csh wdl. The bank is not listening, i also tried customer care call but nothing helped. I gone to bank but they are not listening, i don't know what to do know?