Service but most things going wrong

I took my car for a major service on the 17 th December and paid R6000. They kept it for 3 days and same day when I collected the car the engine over heat. Took it back the next morning they kept it the whole back. <br> After 6 days the headlight stopped working and was advised that the fixed it as per the invoice. On the 2nd February it broke down because of the fan belt that was replaced and the oil is still leaking. Today its the 4th February and still don't have my car. <br> <br> You can even see that the manager does not even bother. As per the adverts saying they service all cars I dont believe that. Hello Peter please help.