Refund Fiasco and not money after 16 days

We bought a Shower door from On Tap Walmer but it was 6 mm glass instead of 8mm. We returned the door and On Tap was supportive in that process. When the money had to be returned the fun started. I am using fun nicely as I do not want to use other expletives. The refund transaction was done to our FNB credit Card on the 28th February 2022. Up until today 16 March 2022 and numerous visits, more than 30 telephone calls to the Manager Roger and follow ups with Standard Bank while I was in store. By the way Standard Bank process apparently is 7 to 14 days to refund a credit card. Toady is day 16 and not a cent into our account. The Manager agreed to pay our money via EFT but once again another empty promise. We are still awaiting R4880,10 and On Tap is now trying to wash their hands from this. I am highly peeved and merely want to state that be careful when you have to get credits. I also learnt that another customer was experiencing the same issue with their refund.