Poor service

I paid R1300 for new shoes but when I opened the box at home the shoes smelled rotten. Upon returning to the store I was informed that it is due to the entire shipment having water damage. And they can't exchange them. I asked for a refund to be told that she can't refund a debit card purchase. And she has no cash to refund me either. I am furious and stuck with shoes I can't use. Please help