Unauthorized deduction from my account

As a loyal customer I'm completely shattered to be the one writing this email. I have been served at various branches, and have never had such an unpleasant experience as I did today. I went to the Ferndale on Republic branch in Randburg, a branch that I am mostly fami**** with since it's the closest to my workplace. I grabbed a few items, got to the till and they swiped my card, the money was deducted from my account. The staff member who was assisting advised that the machine had some network issues, she went on to call the manager to further assist. I showed them both that the money had been deducted from my account, the manager didn't display any willingness to help, she simply dismissed me by saying the money will be transfered back into my account because apparently it wasn't reflecting in the system. Despite me providing solid evidence that the money had been deducted, she just dismissed that and said I should wait 24hrs, she insisted that I couldn't leave with the items I had bought. She then suggested that we phone my banking provider to confirm that the money was deducted and that it will be reversed - when we called, the agent who was assisting confirmed that the money was deducted and that there wasn't any information mentioning that it would be reversed. Even with all the information, the manager showed absolutely no ethics. My money was only reversed by the bank because I had to request them to do so immediately. I spent a whole hour trying to resolve the matter, as patient as I was, the manager seemed unapologetic and unbothered by my frustrations. More than anything, I am so disappointed at how the manager handled the matter. Not once did she apologise for having wasted my time. It's disappointing and I feel I was treated unfairly.