Still can’t fix my new car. No empathy and poor service

I drive a 2020 A200 sedan that started making a ********** squeaking sound when it breaks 3 months after I bought it. I have taken it 3 times now to Mercedes Sandton to report the same issue. After the 2nd time I took it for the same problem and it came back not fixed, I escalated to Mercedes SA at the beginning of April. They told me to take my car back to Sandton again to raise with their technicians. I did that. When I went there Mercedes Sandton assured me that the problem was fixed. Immediately I drove off, the brakes started making the load and embarrassing sound again. I was so upset I called Mercedes SA and they said I need to take the car back to Sandton for the 4th time. I’m tired of being made to run around with a squeaky brand new car, I’ve wasted time, petrol and money driving to Sandton every other week without my issue being solved. Mercedes SA has got the most rude manager named Portia, a service consultant that never contacted me back ever time I called, and the service from Sandton is appalling. I’m soo disappointed.