State Bank Of India [SBI] — oxigen wallet debited (theft) amount 8000 rs from my credit card

Address:

631501

Money transfer from my credit card to www oxigenwallet com gurgaon
I got a phone call thru # at 11.30 hrs 22-sep-2017 ; he introduce herself as sbi bank credit etc. And asked the credit card card no. But i refused to say my card details. And they forced me from that day onward i am unable to login my account and received otp which says 4000rs + 4000rs debited from my card. Immediately i tried to contact sbi credit card but its always waiting pool for my no nearly 30 mins. And unable to contact alter receive messages also form sbi. But they debited amount from my credit card without any information.
After statement received then only i came to know the amount is debited without my knowledge. That transaction is fully cheated and not initiated by me there is no relation ship with www oxigenwallet com gurgaon. The same company cheated lot of people and they complaint already but even though bank not taken any action or block particular company.
Please guide me what to do. I.
Understand sbi - mobile network + www oxigenwallet com gurgaon have illegial relation ship to cheat people