Dissatisfied

I bought a SUV in Dec ‘24. I drove it out of WebuyCars Rustenburg on my way home it started over heating. I live 8 km away from them. I asked how much the fuel consumption is they told me between 10-11 km/L. I phoned the sales manager and told him the situation. He referred me to the mechanic what I went to few days later. Same happened. Wanted to trade it back for another car and they kept giving excuses not to do so. On the Dekra report there was nothing stated of the car that overheats due to broken water pump or the inter cooler pipe that’s clip that is broken. Because of that it loses power. My fuel consumption is 7.4L/km. they told me it’s the it’s the radiator reservoir, I went and tested it. There is no leakages. I am very disappointed in them and will never refer anyone to them or buy anything from them again.