Deals Bazaare — no refund unauthorised debit

Someone from dealsbazaare one Mr. David spoke to me in my number [protected] told they are calling from HDFC credit card section and wanted to send us gifts since I haven't utilised my reward points. Also he told that one time swipe of rs.6500 will be done and once I receive the gift they will credit the amount after getting the receipt. I calf him again told I don't want any gift from the voucher. Pls credit my amount back. Since then no one picks my call. Says they will credit the amount back. Someone says they didn't say like that. Someone disconnects the call. The number which David gave is continuously switched off or not reachable. Pls help me to get the money back. Thanks A Velavan.