Brake Failure

The Car was bought in Feb.,2009 and the Brakes of the Car have failed on 5 occassions in the last one month. The Car was damaged in the 5th brake failure. The car has run for 7000Kms only, Tata Motors is not accepting the fault and simply trying to get away from the issue claiming the brakes are OK and trying to show my deficiency.
Tried to involve top Tata oficials, however they do not reply to my mail and leave the matter to the officer based at gurgaon. He accepted to get the Car repaired at Tatas cost if I accept the CAR is OK, which I have declined, hence they have refused to repair the Car at their cost.
Kindly advise your views and action I should take.