Air India — refund not received

Due to lockdown i had to reschedule my flight so i tried a lot to contact airindia but to no avail then i was left with no choice but to cancel my ticket.

But after more than one and half month of cancelling the ticket i still not received any refund till date.
Even no satisfactory reply is received and due to non receipt of money i am unable to book tickets.
There were 2 bookings as below:

Booking ref - hmlk7
And
Booking ref - y8r0f

Pl do the needful.