BAD SERVICE FROM TATA POLOKWANE

I bought a TATA Xenon at Polokwane last year September and it has since been giving me problems. I took the car for repairs several times as it came with factory faults such as the non-functionality of the wipers, hooter, etc. Every time I take the car to the dealership in Polokwane, it spends a minimum of 2 months and I remain without a car for the duration while my account is being debited for the car payment. The car is now at the dealership again since 31 March 2015 and it has still not been attended to. I was informed that parts for the car will arrive on 20 April 2015, but to my surprise when I called today (07 May) , I was informed that they are still waiting for the parts. When I spoke to the manager at the workshop, he was very rude to me and told me that he doesn't care what I do about the situation, but the truth is if the car is not repaired its not repaired. I am soo disappointed with TATA SA and honestly speaking, I will never advice anyone to buy cars from this brand, they are BAD!