Unhappy with my car after budget insurance has send it to renew it greenstone

They have allocated my car to renew it at greenstone, it came back will missing parts that they said they forgot to install back, the parts where not affected by the accident but they had to order it which took two weeks to get it further more I have my car came back with the engine light on which I have bring it to their attention and said they have fixed it, i drive kilometers and the light was on today I bringing the car for the third time and they claiming they are not responsible for engine light on they will only run test that will reflect the fault, this people have forgotten some of the parts in my car I'm driving a car that is not road worthy at the moment, they have driver chair too.