Webuycars purchase stressing me out

I took collection of a vehicle on Thursday and only drove the car from the dealership. On Friday, I received a failure of drivetrain error on screen. I immediately informed the agent and logged a concern. I also used Uber to go there Saturday morning after agent advised Friday that a tow truck will collect but went quiet on Saturday morning. Another manager advised that he will request the agent's manager to give me a call today.

The agent confirmed this morning that the car will be collected but goes quiet everytime I ask when. He also said a few hours ago the manager will call me, I have not received a call and when I ask when, no answer.

This is an A rated car with a gold status. After taking out finance and paying a deposit, this is how unfair I'm being treated.

I have no confidence in this car or the after sales service.