Air India — Refund

Address:

Gurgaon

We had booked 4 tickets from sydney to delhi and back by AI 301 and AI302. PNR Y6HW3 AND Y6HW4. Flights cancelled due to Covid19. We did not receive any refund despite many requests. Now we got a mail from @Airindian that our tickets have been refunded on 10-8-21. Where the refund has gone? No transaction details of refund are being provided.
Ticket no.[protected] to[protected].
what should I do?