Big Bazaar / Futurebazaar / Future Retail / Hometown — I lost my future pay card

Sir I brought a a all the kirana thing from big bazaar in siliguri cos mos mall . then after a billing I have paid the money in cash and given my payback card for updating the bonus point, meanwhile I forgot to collect my payback card and left the counter. As soon I realized about my payback card I went back to same counter and asked for the same.The salesman on the counter accepted that one payback card is left by some one and kept with him. He asked me about the payback card no which I could not tell to him, Then he refused to return the payback card stating that it could be of somebody else. Therefore I request you to look into the matter and trace out my card, If not possible then block the same against any misuse. And pls tell m how a new card with my old tranjection

My name is - SUSHANTA BOSE
My registered phone number is - [protected]