Horrid after sales service

We'll for starters i was sold a faulty vehicle from Imperial Nissan (250 South Coast Road) Durban. when i test drove the vehicle i noticed the engine was a bit rowdy. The salesman acknowledged this and assured me it will be sorted out before i took delivery of the vehicle. when i went to fetch the vehicle the noise was still there and was then told to take delivery of the vehicle as you have 7days to bring the vehicle back if you are not happy with it. i took it back a couple of days later. ever since then no one has been able to tell me whats wrong with it. two weeks later and every time i call the branch its "they working on it". what the hell are they working on it what i need to know. how can they sell me a vehicle knowing it wasn't repaired to my satisfaction? why is it that no one ever returns my calls ? is there no competent in that branch that can tell me what repairs are been undertaken ?

bitterly disappointed Pavalen Naidu