Poor service

I went to shoprite liquor store to purchase some drinks. After the cashier scanned my items, I advised her that I would be paying by card. I swiped my card and entered my PIN, and the card machine clearly indicated that the transaction was approved. However, the till did not print a receipt and subsequently froze. The cashier then called the supervisor, Jan, to assist. Jan came over and attempted to resolve the issue by working on the till. Eventually, he had to restart the computer. I waited patiently for more than 15 minutes while this was being dealt with. After restarting the system, Jan told me that I needed to pay for the goods again. I explained that the payment had already been approved on my side and that I was not prepared to make a second payment for the same goods. I was then told that I could leave the store without the receipt and that I must pay again, and that I would supposedly be refunded the following day once their system was sorted out. At that point, I had already been waiting for more than 20 minutes. I found it extremely frustrating and unacceptable that, after the payment had been approved, I was expected to either pay twice or leave the store and then return another day to resolve an issue that was caused by the store's system. I ultimately left the store with no goods and money deducted from my account. I am extremely angry and disappointed by the way this matter was handled, particularly by the supervisor, Jan. I would also like to raise a concern about whether customers at this particular branch are receiving the same standard of service they would receive at branches in more affluent areas. I sincerely hope that customers at Jabulani Mall are not being treated differently simply because of the location of the store. I look forward to receiving a response and a proper resolution to this matter. Kind regards, Thabo