Dissatisfaction with Jeep South Africa - sold me faulty brand new car

I bought a brand new Keep Grand Cherokee on January 26th 2022 at Jeep Centurion, Pretoria and in May the car started giving me problems. I returned it to Jeep Menlyn for assistance and they started fixing it and to date my car is still not back. All I get is they are replacing a part, after which am told they are replacing another part. Why does a brand new car require so many part replacements? And for each part we have to wait about 4 to 6 weeks as parts are coming from the United States. Jeep has been reluctant to consider giving me a replacement car of my money back. I believe that I was sold a faulty car and the ethical thing to do was to admit and provide me with a replacement (I was willing to accept a demo car). I do not feel safe any more with a car that has been stripped and have multiple parts replaced. Jeep is taking me for a ride and that is unacceptable. I have been utterly inconvenienced by their bad customer service.