who takes responsibility for this

i tried to cash in my smart shopper points only to be told it is not my card since the card was not linked to my ID no, card could have only got swapped at the tills by the teller. there should be a way for them to check and see if my card is being used and how did i end up with someone elses card......and try and return the card to the owner and be able to get my card back or stop it and give me my money and issue me with a new card.<br> <br> Don't implement something without proper security in place.