Bad after sale service, bad communication, don't trust their warranty

They just close a sale, I bought a car on the 12th at webuycar silverlakes, which was a gold sticker, was sent to service and I even took their warranty and nestar tracking service.

I sent car back as it showed a signed of over heating the same week, they just exchanged the coolant container as they said the one that was in the car had a leak and removed the engine light, and they said they fixed it.

I then when back to collect the car, the same day as I got a call saying it has been fix. Later that day few minutes after collecting the car, the engine light was on again and I told them that the is something wrong with the car and quiet frankly I don't want it no more, they said canceling the car finance will take longer than fixing.

And now two weeks later to three weeks, they are busy telling me that they are waiting for management approval for the car to be repaired.

Such stress for a car that I drove less than 5 days and has been with them more than I have driven it.