Horrible service and sell engine damaged cars

Bought a bakkie at we buy cars Dome branch for R388 000 same day on my way home after driving 70km started overheating. The noise level very high. Reported it to sales man and F&I. Fast forward in a week's time i arranged to bring the car back for them to check it the car couldn't reach them as it completely died on the road to them and I had to pay R6000 to transport it to their branch. Im want them to take back their car and cancel the sale but their refusing forcing me to be stucked with 1 week financed car with dead engine. Never buy from We buy car you will regret like me.