Tata Motors — Refund for car cancellation

Dear sir, My name is Bhanwar lal Salvi and I booked a tata nexon(xz) on 17 decenber 2020(serial no. 1132) and on 2 april 2021 I cancel the car because of delay in delivery. And now i m regularly requesting the tata motors shekhawati, udaipur, rajasthan manager sharad mathur for refund but he is not answering my calls. There is an amount of 51000.
Please resolve my problem as soon as possible.
Thanking you
Name = Bhanwar lal salvi
Contact = [protected]