Unfair treatment by Kia Silverton

Good Day, I would like to convey my disappointment and dissatisfaction with KIA Silverton. I took my car for major service which costed me R5868..which included a sensor that needed to be replaced on the 24th November 2020 . 1st no full report was provided in terms of the assessment of the car ,I was given the cost breakdown and the replacement of the part.

Within a week after collecting the car ,I have found myself without a car I was on my way to work and the car was not responding...when I contacted KIA Silverton to check what could be wrong with the car I was told that it was OIL VALVE that was faulty..

I need to know how can they assess the car and couldn't pick up that they was something wrong with the OIL VALVE. Now they need another R4000 that I don't have...

I feel they are taking an advantage and since I am a woman.My concern is that I have reported the matter to KIA SA and no feedback back received as yet .I don't have a car .

I need someone to provide me with the way forward.