R720 transaction went of twice.NO attempt 2 refund

I bought perfume on Wednesday and I only swiped my card once but the transaction went off twice. It was the amount of R720 and therefore the amount is now R1440. I went directly after this happened to customer service to report the problem. They never took my bank statement but only asked my name and number and accout number. The male staff member told me that the money will be back in my account in 24hours. It is now 48hours that have passed and no money has been paid in my account. One of the customer service staff members didn't make any effort to help us, and service was pathetic. I as a customer has to make all the effort to get the money back, and I am really dissapointed in Edgars.