Tata Motors — Tata tiago petrol amt 1 month delay in delivery after payment

Address:	Mumbai City, Maharashtra, 629001
Website:	Tatamotors

I, augustine tharappel have done the full payment for a tata tiago petrol amt at kumaran automobiles, nagercoil on 4th april after they informed that the car is out for delivery.
Till today (8th may), the car has not been delivered as it is pending for registration at rto. The reason they say is that the tamilnadu transport commissioner has not approved the new amt design and hence car cannot be driven on road.
My grievance is that if the car has not been approved by the government in tamilnadu, why did tata motors take full payment from me. The emi and insurance for more than a month is wasted. Also the warranty is wasted for a month. Hence i would like tata motors to cancel the invoice and to refund me the invoice value and the insurance amount which cannot be cancelled.
The same concern has been escalated to tata motors by email and still i haven't got a response after 2 to 3 days from them.