Patched Cars - DONT SUPPORT THIS DEALERSHIP

Williams Hunt in Randburg is by far a **** , during the month of September 2018 i purchased a pre-owned Audi S5 , the first month the gearbox packed in that took 4 months to fix , then the control arms gave in then the cylinder head gasket gave in due to preexisting conditions , this car is only 1 year with me and i have only used it for 1 month solid, currently it is sitting with the dealership suggested mechanic who requests R59000 for the car to be fixed, its been now 4 months that i am paying for a car with out using it and it is collecting dust. They have given me 11 courtesy cars in the time i have purchased this car, i really need resolution on this matter.My sister purchased a car as well with similar issue from this same dealership, this seems like a trend.I am not willing to pay R59000 for repairs for a car that i haven't even used!!!!!