Please help me get justice at kia fourways

I bought kia picanto at kia fourways last year January 2018. It was a new car at 15000km at the time of purchase. In April last year I took the car home KZN to show my family, on my way home I experienced severe power failure on the car in such a way that at times I'll be driving on the truck lane or drive on emergency lane until it picks up power. I reported this to kia dealership and was told to take the car to service to they can have it checked. I did that and they couldn't find anything wrong with the car. I then took it back. I drove the car to work with no problems. I drove long distance again this year march it still have the same problem. I took the car in for service again this time I was furious and told them to find what wrong or give me a new car. They checked the car and find that there is something wrong with the engine and they will order the part and cover it under warranty. While there car was with them I had to rely on lifts and uber which is very expensive.They fixed it and I told them I'll drive long distance again and give them feed back. I went home in June this years and still experienced the same problem. I phone kia fourways and demanded to speak to the manager who is very hard to get and if you do get hold of him,he never calls you back as promised. My car is at kia service at fourways since the 1st of this month i was told they ordered a part that needed to be fixed which they said it the cause of the power failure on the car and I could get my car on Monday the 5th later I was told the part is being delayed I will get the car on Tuesday. Which I agreed. Now when I was supposed to get my car back I was told that liquid capital hasn't updated the system on their side and they can not give me my car back without the annual service being done as it due. I asked for a courtesy car which I was denied and told that the warranty fixing on my car is done hence I don't qualify for a courtesy car. I asked what should I do since they are the ones who sent the wrong information to liquid capital when I bought the car to say I got the car at 2500km when it was 15000km. So liquid capital has terminated the contract due to their poor admin. I am using uber and public transport for two weeks now and it very expensive. Yesterday I got a call from four ways kia service to say they took my car for car wash yesterday and only to find that it no longer functioning properly there is something wrong with computer box and they will place on order to replace. How many part are gonna get replaced on that car when I was told it new. I still have no car as we speak. What must I do. Please HELP