Dissatisfied with service and Spars system glitches

I had very bad experience at Kwamashu Spar Tops, mind you I don't even drink but was there to by alcohol as we had an appeasing ceremony on the 03/04/22. So I bought for an amount of R890 and the transaction was successful but the lady at the till told me it wasn't because the machine didn't produce a receipt, I then changed and used my capitec from my standard bank card and the total order came to R1890 if not slightly less which was also successful.. I then left with hope that since the lady at the till said the first amount paid was going to be reversed. On Monday I sent the shop an email with my bank statement reflecting the fees owed to me, spoke to a lady called Londy Mshibe who assured me this was escalated to finance and I will be getting a call, Tuesday I sent follow up email which was ignored then on Wednesday sent another follow up then got call from another lady who told me they are aware of the problem finance will get back to me, but to date I have not heard from their finance and this is frustrating because for a big store like Spar they have the audecity to say they acknowledge the problem but not coming up with effective solutions because I don't owe them anything the documents they requested for were submitted now what is so difficult for them to reimburse me, this is an inconvenience because it's clear they are not prioritizing this matter as I have not been contacted R870 might be small for the shop but to me it its alot and it has put me in an inconvenience. If your shop has system issues they shouldn't be made of clients problems. Ideally I'd say for this I want to be compensated and get someone from finance to call me immediately