Renault service horrible!

I bought a Sandero. The day I was susposed to collect it I was told the saftey tint was faulty, I would get the car the next day. The next day the engine light came on, they said they fixed it and delivered my car. Apon delivery the engine light came on again. They took the car back. I went back to the dealership and waited 2 and a half hours for my car. When I finally drove the car it made strange noises. On my way back to work the light came on again. They collected the car and promised me a newcar the next Wednesday. On Wedneaday the manager called and told me I wouldnt get a new car as promised as my car was fixed. I demanded a guarentee that if it broke again that I would get a new car, the regional manager became very rude but I recieved my guarentee and fixed car. When I got home and stepped out my car I found four deep long scratches-through to the body-on the bottom of the car.<br> I called Renault head office only to be told they couldn't help and that I must see a lawyer.