renew it marlboro is a fly by night panelbeaters

I was called again for the 3rd time by renew it marlboro to say they have test driven my my car and had put it on the machine and all is well but when i get there the car still has the same fault. renew it marlboro dont know what they are doing.they are just running a fly by night panelbeaters.i'll never take my car there again.and when I was waiting for my car other clients were also complaining about the terrible job done on their cars