KING OF CARS Junk

I bought a 2022 Toyota Hilux at King Of Car on the 31st of May 2023. After buying the bakkie I had to wait for my contract, so I left my bakkie to stand in my secure yard in my secure garaged parking while waiting for the contract. My bakkie finally started working last week and my driver heard a weird noise and reported it to me, I made the salesman aware who insisted that I take the bakkie to Toyota directly. I insisted to return it to KOC to check it out first. My driver took it in today and KOC claims that someone decat the bakkie and replaced it with a pipe. When I got home I took photos of the exhausted and noticed that a pipe has been welded there and it is clear that this had been done way before I even bought the bakkie.KOC wants me to pay to have this repaired but they sold me the vehicle in this poor condition and their poor welding job gave in hence this problem was exposed.