Disgusting service at Brooklyn Mall Cotton On

Our experience at Cotton On was disgusting. On 1st February I went to Brooklyn store to buy a R800 gift voucher for a friend. There was something wrong with the POS, I was back and forth between tills for about half an hour, the staff could not manage to print a proper receipt for me, and my card was debited 4 times. Eventually my bank reversed 2 of the 4 transactions, but I still have 2 transactions that were debited from my bank account. So I have been charged R1600 for the R800 voucher. I have called the store on various occasions, been into the store 3 times, been treated very rudely and impatiently by the staff who just insist that the transaction only went off once on their side, even when I show them the debit went off twice from my bank account. Shocking.