Worst services ever received from a business as they are not able to resolve my ongoing complaint.

Since 12 October 2020 was my last day I was able to make a purchase at ShopRite and the very same day about 2 hours later I went to make another purchase using my RCS card and declined. The error code says system malfunction. I have called RCS since this given date I was told to go to a ShopRite store and call RCS when I'm there so that their merchant services department could assist. I did that and a query was escalated. Never got feedback. Days later I called to follow up I was told I'll get feedback soon and again waited and nothing. Upon calling probably 100 times speaking to different agents I was advised from a agent by the name of Charney that I will need to go to my closest game store for a card replacement and I did that and still the issue persist, before even getting the new card the lady in the game store knew exactly what I'm going through and she said giving me a new card won't work because she had also slot of customers with the same issue and they come back and say the card still doesn't swipe at ShopRite. So anyway I got the card as I was instructed went to ShopRite and it didn't work. I have tried ShopRite Woodstock, seapoint, Cape town CBD, then I also tried checkers canal walk, checkers seapoint, and checkers hout bay and the card declines everywhere under the ShopRite checkers group stores. I called again and was advised again and again to go to a ShopRite store and call from there and speak to merchant services and give error codes as I said it gives the same error code (system malfunction). May I add upon everytime I had to go to a ShopRite store I at times used my car which doesn't drive on water so petrol I'm wasting each time. Other days I have to take a Uber which cost me around R40 a trip to a ShopRite store and to game stores. Thus far I have wasted more money to try and resolve a problem from RCS and ShopRite side. The amount of stress and frustration I had to go through is ****ing believable. I have requested a manager to call me back on each call and guess what 3 months later not one manager called me back regarding my complaints and requests which is something I strongly question why? Yesterday and today I requested a call back tried to chat with an agent nobody replies on their platforms. So I'm thinking the minute they go through my account and the notes I get ignored because it has happened they drop my call. So RCS you are ****** pathetic and your customer service department, merchant services department, it department and management department sucks. Because my complaint has been escalated to all these departments and nobody bothers to call back so I wonder is my escalation still open or has it been closed with not informing me?