Car problems

We bought a car on the 4th of April 2023, same day when we held to polokwane the car gave us issue, smelling of brakes, the engine sound like a treckert, when driving 120 sp and apply a brake the vehicle started to vaborate, when it's raining the boot will be full off water, we tried to communicate with them regarding this matter they only respond we got from them is that's this is a second hand car what where we expecting, after wards they told us to bring the car to them, we did so, they had the car for 5 days when it's come back to us we realize that nothing was fixed, we communicate with the salesperson Mr P Phapha, his manager is Tubby. He told us to bring the car again, we do so another 5 days during that 5 days the car was always moving one place to another when we ask them they told us that the car was parked. It's for the 4th time giving them the car to fixed it but dololo. We asked them that means the tracker is lying to us, their respond was yes. We then took the car for service they provide us with AA company which will be the one they should make a service for us for 2 years, boom the service is not done by AA is done by them n by that time our car didn't get serviced so we a confused, there is money we paying for AA to service our car but the service is not done by AA but is done by Golden Era motors. This whole thing is affecting us emotional, mentally and financially. We really need help either they give us the good car or we go another dealership. We need a car urgently. South Africans when you going to buy a car, especially at Golden Era motors gezina make sure you go along with the mechanic or you will suffer the consequences of purchasing the car to them.