Bad service experience

I have had a very bad experience with Leohaese BMW centurion. I have taken in my BMW X5M for service. They charged us more than thirty thousand rands. We took the car and drove it for about a week and it started giving us engen faults, we took it back in, they diagnosed the vehicle and and gave us the initial quote of more than Thirty thousand rands, we gave then a go ahead and fix the car. They then gave us a revised quote of Fourty seven thousand rands. We also approve the quote and gave them the go ahead. They subsequently gave us another quotation that was going to increase the bill to fifty six thousand rands, we indicated that we will not be able to afford that. They called us to tell us the car was done and we can collect it. it was on a Friday the 2nd July 2021. we did not drive far before the same warning lights we took the car in with started coming back. we call them immediately to inform them about it and they told us the car had many errors and they only dealt with a few. We question the fact that we just paid Fourty seven thousand rands on the car but the car does not seem to have been fixed at all, although the service adviser was a bit understanding to our concerns, the service manager was very rude and quick to dismiss us and showed little to no consideration to our concern. This is very bad, considering that we spent such a lot of money but our car is still not fixed and they refuse to take any responsibility