Unsatidfactory Service

My name is Tumelo Mo***eng and I drive a 2014 Opel Corsa Essentia 5 door. Towards the end of March my car notified me that it was due for its 125000km. I then decided to call Barloworld Isuzu Johannesburg (City Deep) since I had taken it before for its 60000km and 75000km for a service. I was assisted by a lady called Tumi who then gave me a date that I cannot confirm at the current state. On the day of the service I was held up with business I therefore asked my wife to drive the car for me to the center. In the afternoon as she fetched the car there she called me after driving out of the center to inform me that the car wasn't driving smooth as it was and that furthermore she had notified them that the car wasn't driving smooth, was shaking and unbalanced before she could even drive out of the yard and the lady who was assisting us by the name of Tumi insisted that the car was alright and just needed to be driven yet the car had an indicating/warning light(1st of all she's already putting my wife's life in danger for making her drive a car that isn't in any good condition). Immediately when i received that call from ym wife I told her to drive back and inform them that I needed my car fixed because it was in a perfect state before we took it there. When she got there she called me again to inform me of a bad attitude and service she had received from Tumi when she returned the car as she was more concerned about her knock-off time rather than the customer's time and service. I furthermore tried to call Tumi to follow up on what was wrong with my car but she cared not to answer my call. In the process while my wife awaits for the car the problem with the car was "at least" rectified but we were not informed on what was wrong. She then took the car and drove home. The next day my wife used the car to work and when she got home she informed me that the car was alerting her that it was due for service. I then asked her to call Tumi and inform her. She took the car back to GM Barloworld and they said it just needed to be reset. A week later I started to drive the car for the first time after the service and as I was driving to a meeting with the very same car it I felt two things: 1. When my car was idling it would make a reaction that I have never seen/heard from it before; as if it is running out of power or something 2. As I drive the car and change gears back (mostly to 3) the car continues to minimally lose power. At first I thought this was just something that would fade but this past weekend I drove the very same car to Bloemfontein and I discovered that the reaction is getting worse. Now none of these reactions occurred before my car was taken for service. I took my wife for a drive with the car and asked if this is what was happening with the car when she fetched it and she confirmed that it is although that time it was worse.

Today I asked my wife again to call Tumi to inform her of the reaction of the car after the service since I am busy but she once more again received an unsatisfactory service from her. Tumi has told her that we need to pay for the car to be fixed if it is broken.

I have owned several cars (Opels) before and I have taken my car to GM Honeydew before and I used to receive an excellent service from them. It was so excellent that thecenter manager would call me each time after servicing my cars and inform me that he was taking them out for a test drive after each service, but I have never received that kind of service at GM Barloworld (City Deep).

Now as a customer I need to know if it is fair for me to pay for something that gave me no problems at all before the service and I need something to be done with Tumi's attitude towards us. This is completely not satisfying I will not pay for lack of service performed on my car and I have each and every right to call my motorplan to inform them of this.

Somebody with professional help needs to call me on ********** 750 because I am not going to drive this vehicle nor fix it with my money for GM Barloworld's mistakes.