WeBuyCars is the worst when it comes to after sales

Extremely disappointed and frustrated with WeBuyCars. I have bought and sold 3 cars with them.

I bought a Nissan np300 hardbody less than a month ago. Everything was listed as in good condition except the CV joints which were noted to be noisy. In the middle of the highway the car just caught heavy smoke on the exhaust and the engine and leaks a lot of oil, I switched it off trying to get to the side of the road because it was revving itself loudly. I called AA to tow the car and contacted Webuycars. This was Thursday but no one has reached out. I called and got assisted by a very rude and dismissive Gerald who said my case was assigned to Mathaphelo. I am trying to call and not getting any help. I have not even received the papers for the car. This is a major problem that was not mentioned