Shockingly poor service from BMW Emalahleni

I purchased a BMW X2 in June 2021 from BMW Emalahleni. A few months later it started giving me problems with the navigation system and it was taken to the dealership on numerous occasions for diagnostics and they claimed to not know what was wrong. The one time that I will never forget was when one of their technicians walked to my car with the most stinking attitude asking my husband and I why cant we just adjust the settings on the navigation system. We asked him to change it for us and he was unable to, just like us. I have missed many days of work whenever BMW asked me to book the car in for them to check what is wrong. The last time was in December 2022 when I missed work again and go and stage a sit in at BMW in order to be assisted. I was assisted by Bafana Dlamini, nice guy but he has failed to deliver because in January 2023 I took the car in and was made to pay over R2000 labor of the replacement of the faulty part. I did not even drive the car for one month and the problem was back. I phoned BMW Emalahleni in early February and informed them about the problem. The gentleman I spoke to said he will get back to me and there has been no correspondence ever since. The problem has since worsened and it is unbearable. I use the car for work purposes and I would like to know from the side of BMW what will it take for them to resolve this issue?