Poor or no service from the workshop

We bought a Chevrolet Captiva 2010 model last year August from the Kimberley branch. It was a used vehicle with full service history. A day after that it went back for some minor details to be sorted. Then beginning November for some major details. We received the vehicle back the 16th December after many lies and phone calls to the dealer it self and the \big shots"in Johannesburg. As a result we had to cancel our holiday because we didn't have our vehicle. Just before 31st December there was something wrong again and went in for a week. Problem sorter? Not! Today we returned from a long distance trip with the same problem. We stopped at the dealer and he confirmed something is not rite. Booked in! We have been paying monthly installments for courtesy cars and not OURS. They claimed from our insurance for faults fixed which they never did. *****. They \""mechanics\"" have bad attitudes and dared to accuse us today that maybe we just cant drive. We have people in our complex complaining about them as well and have heard of other people with similar problems. """