bad service

Took my car in for replacing of head gasket. After stripping jaco said and gave letter from engineering shop that my cylinder head must be replaced as it is skimmed to maximum and skimmed scew on one side. We agreed that jaco will buy new head for R5900 and to rebuild valves onto new head for R980. We battled for three weeks to get our car back. We got it back on the 12th december 2014 with a oil leak. Took it back and came back still with oil leak. Jaco closed for december holidays and we took car back in january 2015. He fixed oil leak again and after about 5 days of driving car, car made strange noise. We contacted jaco to come and check car and he said we must tow car back to his shop. After a few days again he said it is computor box which will cost R7000 and we can take car somewhere else to be fixed. We got advance motors to tow car to their shop and after investigation saw the noise is from the valves hitting the head. Took head off and took it to engineering shop who said the head is skimmed scew on one side. So the conclution is head were never replaced. We confronted jaco but dont get response. We want our money back. In the meantime we still make use of a taxi