PAY FOR SOMETHING YOU DONT HAVE

We bought a car from Jubilee Motors Springs in Nov'14.We drove this car for 2 weeks when the first problem starts.We took the car back and asked them to sort out the airbag light that was on the whole time They said we must bring the car back the following week what we did after 3day when we received the car back again the next morning when starting the car the same problem we phone them and tell them what the problem is again they said we must bring back the car we drop of the car for a whole week to get this fixed in the meanwhile we phone them continuously without any clear answers. Eventually we receive the car back 1 week later the problem still arise they ask us to bring back the car in Jan'15 as there mechanics are all on leave we took the car back in January where they have send the car to Audi springs they try to claim through the maintenance plan witch they have decline the claim just reset all the lights and call us and to fetch the car after another week. The engine light came on four weeks ago. They have the car with them for 3 weeks and we must pay them R4000 to fixed all this.We have paid R2000 when we phone them they cant tell us when we can have our car