Bough broken second hand car

We bough a second hand car from Ford in Kemptonpark. Since the first day we had troubles with the car. All the light will suddenly go on then the radio go on and off then when you break the hazards go on. We had the car at ford then they cant find anything. Then we took it back again it cost us 2200 but still wasn't fix. Know we took it back again now the alternator must be replace and have to pay 3300. We bought the car under false pretences the warranty was discontinued due the fact that the previous owner did not service the car at the right mileage. So know we have to pay all that money. Do you think is fair to us as buyer's?