Tata Motors — Free service dispute with dealer

I hv booked with Deric motors, Tirunelveli for a Tiago XZ+ manual during Apr-21 and which was delivered to me only on 23-June-2021.

For every free service the dealer was telling me the date will be counted from Apr-21 which was the billing date in their record.

Now also everyday their staff calling me and informing that my 3rd free service due is 31-03-22 and I hv to complete it before this date.

But actually it should be calculated from the date of delivery only for which they don't agree. . Kindly intervene and redolve, pl.

My vehicle regn no : TN 72 BS 9581
Chasis no : MAT626350MKD33327

Regards,
Sadasivam,
Tirunelveli.