MR PRICE CLEARWATER BAD CONDUCT OF BUSINESS

I went to Mr Price Clothing at Clearwater mall on Friday 6 June and purchased a T shirt for the amount of R149.99 but i was charged twice for that amount on my bank card. I disputed this with the cashier but she was completely unhelpful and my situation to her didn't seem to matter so i demanded to see the manager. The manager Melissa came to see me and i explained to her and even showed her that my card was processed twice for the amount of R149.99 and i simply wanted a refund. I was told that was not possible and that i would have to take it up with my bank. TOTALLY UNACCEPTABLE! I demanded that she contact the bank and dispute the transactions and request a refund. This was NOT resolved and still NOT resolved!!! IT IS NOW SUNDAY AND I STILL DONT HAVE MY REFUND?????? I CONTACTED MY BANK AND EXPLAINED THE SITUATION AND WAS INFORMED THAT THERE WAS TWO TRANSACTIONS FOR R149.99 BUT NO PROCESS FOR A REFUND FOR THE SECOND AMOUNT AND NOTHING WAS ACTUALLY DONE BY THE MANAGER MELISSA. I WILL NEVER EVER GO TO THAT MR PRICE AT CLEARWATER AGAIN, THIS SEEMS TO BE THE WAY THEY CONDUCT BUSINESS BY DOUBLING TRANSACTIONS ON CUSTOMERS CARDS AND THEN BLAMING THE BANK FOR THE PROBLEM!!!!!!! ********* AND TOTALLY UNACCEPTABLE!