Tata Motors - Nano — Tata car dealer sold a piece of junk car

Address:

Kollam, Kerala, 691302

Its been a couple of yeras now since I purchased TATA NANO. Since then it has been in service station than at my home. The car was having over heat issue. Whenever me and my family go for a trip this car always brokedown and we have stay in road for hours to get help. Somehow, after many months useless TATA mechanics had receified it. So, now so far not heating issues.
Now it is break fail, when the first time it was break failed I was travelling with my mom, thank god, the hand break worked and we were safe. It was taken to MohanDas Motors, they informed it is rectified. Now, after 3-4 months it happened again, the break failed again and this time also I was saved as the road was empty and I managed to apply the handbreaks.
From the begining, I had notfied TATA Motors that they sold me a piece of junk and need a replacement or refund. But they refused and rectified it. I am sure they are waiting for my warranty to get over and charge me thereafter for the services.

Please help me with my car, Its a moving coffin.