Bad service delivery

I bought a car a few months ago and upon inspecting I discovered that there was a dent in the front bar under the engine cover and that the car was in an accident. The radiator and panels was damaged. After some argument they fixed the radiator but now I have a leak and is losing anti-freeze while I drive (This I'm told is a big problem in the engine). I have brought this to their attention but is still waiting for a response, just like I am still waiting for them to send me my contract which I had asked for over 3 months ago. Not the service that I expected from a dealership with such a good reputation.