PAYING FOR A CAR I DON'T HAVE

I have recently purchased a Hyundai i20 from McCarthy Toyota Automark Kingsmead. Till date i have only had the car in my possession for about a week or so. The remainder of times the car is with the dealership for repairs. I the owner have to drive and fault find the car, then drive the Technician and show him the fault and then they take the car for repairs. Uptill today (23/04/2015) the vehicle is in the workshop for over a week attending to a gearbox problem. No communication from the dealership as to what is going on. Poor poor service from management. The deal is only sweet before you sign the documents. Also do not accept a courtesy vehicle from Automark. Their definition of courtesy vehicle does not match that of the English dictionary.