City wheels sold me 2 faulty cars

My name is Siphamandla Majola, I purchased a car VW Tiguan 2010 model for R155000 on the 28/06/2017 from City wheels Auctioneers in Gezina Pretoria ( ********** / ********** , un aware that it was faulty. I later found out that the car couldn’t rave over 3000 of which I told the auctioneer. Eventually they told me that their mechanic in the back yard could fix the car as it was a small problem according to them. I was then told to pay the mechanic R5000 of which I did . But nothing was fixed as the problem continued. The mechanic then told me to pay R1500 as he had figured the really problem and I paid, but the problem was never fixed. He told me that the car needed service of which I gave him a R1000, but the problem continued. I was forced to do the change of ownership as the permit had expired of which I paid R900. After losing money in trying to fix the car, they then told me to bring back the car to the auction so that they can re-sale it to recover my money, unfortunately they went on to sell the car at a very law price (R125000)with a very big price different. They tried to give me the little money of which I refused, and later on they said they will get me another car with the same value without any problems. Eventually they gave me another car (Jeep Compas 2.0 2011 model on the 29/08/2017)but only to find out that it has a gearbox problem of which they told me today 05-09-2017that I must fix that car on my own.