Bad Service

My wife bought clothes for the kids to wear to work and it wasnt used and then wanted to return it at the Parow centre branch .The Manager was extremely unhelpful and insisted that the debit card nr and the till slip does not matcvh .Agreed on that ,however as that was the card that was used to purchase the goods and it is the ONLY card my wife has ,how does a different account number show on their slip? I feel that someone slipped up and now we are stuck with clothes to the value of over R800 . Very dissapointed .