Unsatisfactory treatment at Service

Just wanted to voice out a complaint that I have raised with Jeep/Chrysler Head Office about my discontentment at the state of my car after service at Cargo Motors in Klerksdorp. My car went for service on the 18 August 2015, about two weeks after that it was not driving properly and the electric throttle light was coming on. After that it came on periodically and the car was pulling very heavily. I called Cargo Motors and they advised I bring it back, I told them I would not pay anything as I had already paid R 3 856 two weeks prior. On the 14 September I took it one more by then I had also discovered that the air conditioner was not working. I was told after it was seen to that it was not computerised properly and that something had hit the air con filter , that is why the gas was leaking. The car drove well up till 18 September were the electric throttle light came on I had to drive back home being about 300 km away. Luckily I made it without a total breakdown and since I arrived at home the car shakes when it is switched on and does not pick up speed. Since 18 September 2015 I have had to park it. I will not ever take my car to Cargo Motors in Klerksdorp after such treatment.