Poor service and been sold a bad car with a name so called brand new car

I bought a brand new Kia Sonet 2025 model...within few hours after I left the garage in Randburg I experienced a blowing air on passenger window. I informed my sales man Ernest Masha and he said he is sorry. He then said he will book a car for maintenance. I had to call day and night following up with regards to the booking of my car it eventually happened. At first it was not fixed because they said a certain part need to be changed...I asked Masha isn't this car brand new and why parts need to be changed? He said is mechanical issue of which he himself was not aware of. I asked him the quality checks report of this car he couldn't provide. I asked him, did you guys test drive this car, he said only mechanic not him. Fine eventually the issue was fixed....however another annoying sounds were noted after my car was back from repair. The noise noted to be by the roof next to where the lights are situated...sound like of a coin being left around and when the car move, the coin just float as it doesn't have a balance. I informed Ernest again about what I noted after my car came from the repair. He booked my car again and it was claimed that it was fixed....immediately when I drive out of the garage the noise was noted again. I immediately informed him about the matter. And again noted another annoying sound that comes from the back as if something was not fitted properly. All this issue I had to do follow up with Ernest Masha to all be fixed. If I don't call he never calls. Mind you I bought so called a brand new car which already been booked for maintenance repar more than twice but still problems not been fixed. I bought this car end of April 2025 and even now October 2025 my car still not fixed