Overcharged on iterm and did not get refund

Bought a pair of shoes on laybye at edgars store(****wood uitenhage) it was on the 21/06/2024 using my capitec card to swipe, transaction declined at first but couldn't see the error only the cashier was able to see had to put in my card again and it went through to my suprise got the notification that shows the amount that was deducted to my account was R500 instead of R100, the iterm was R400 in total and I made a lybye for R100.

Cashier called the manager waited for 45minutes it was not resolved they called the heard office n also was not resolved they told me I won't be able to go home with the iterm although the transaction went through but promised that I will be refunded during the course of day ask them to be exact they promised 12 o'clock following day till now no feed back nothing I'm suffering the mistake that was made by them ,Customer deserve better than that. The manager was busy telling me that this was Technicall problem, I pay from my hard earned money.now im being inconveniencesed had to borrow money and go up ad down to the store. I need the items I purchased whilst they are busy dealing with their IT systems. I also need a formal written apology and token/gift