Recurring Start/Stop Warning Followed by Serious Engine Problems – Concerns About Volkswagen's Handling of My Taigo R

I bought my VW Taigo R, on the 7th of July 2024, in February when I took it for *** km service I reported to the lady who received it that it sometimes displays "Error start/stop" notification on the screen which disappears after driving for few kilometres, and she ask which fuel am I using and I said 95 octane then she replied that I must change to 93 octane fuel because in Gauteng my car must use 93 because it's an inland area. I changed the fuel, still that "error:start/stop" frequently came and go. I went back to using 95 and it disappeared. On the 23/09/2026 I took my car for *** km service at VW Strijdom park as usual, I was the 1st to arrive but got my car after 16:00. On the Friday the 9th of October, after work around 16:20 hours, that sign came name, this time it did not disappear, after driving for more than 5 km, the car started losing power to accelerate, when I pressed the accelerator it was not picking up but moving slowly like a car that the gear is on neutral, I drove slowly because I was afraid of parking on the road side in JHB, Florida, when I reached Malibongwe drive, the car started to vibrate even when it's on parked mode, that's when I called VW Stridjom park and they said I must bring the car on Monday(13/10/2026). I drove slowly until I reached home, the following day, the car was towed to VW Strijdom park, On Monday before they even assessed the car when I called to follow up on what could be the problem I was told that the problem was caused by 95 fuel, I told them to wait for the diagnostic test. None of the diagnostic tests confirmed that the petrol caused the problem. I requested for those diagnostic tests, but on their invoice they wrote that when the error appears again I must come and the service of fixing it will not be covered under warranty, and when I check the diagnostic tests they did not fix the root cause. I reported the matter to VW South Africa, who did not investigate the matter and they said they trust their technicians. I also reported the matter to Motor Industry Ombudsman South Africa (MIOSA), I'm waiting on their final response after making my submission and vw made their submission, where they did not clarify how they concluded that 95 is the cause of the problem. This is so difficult for me, I'm driving my car with fear, because the issue according to the invoice was not treated, they just treated the symptoms. MIOSA have not yet responded.