Poor Customer Service

I bought a car from that dealership on the 23rd of March 2018, the car had engine light on so when I went back to the dealership I was given R 10 000 to go fix the light or whatever the problem it is, I then went to bmw Alberton where I was told that the engine is dead and it needs to be replaced. I emiditiately contacted the owner of the dealership and told me to call his lawyer. He also agreed that he will cover half of the cost towards the problem which the car has. I'm very much disappointed with thier service and how they are treating me,I bought the car cash and I feel being ****** and sold something which I'm not enjoying.