Air India — Did not refund my money even after 50 days

I have cancelled tickets on 9th Dec 2020 and still have not received money to my credit card account.

Ticket Booking number: H2DM4
ETicket numbers#:[protected],[protected],[protected],[protected]

My Address: 7022 Rackham Way, Hanover, MD, USA, 21076
Mobile: +[protected]
Flight Numbers:
Flight: AI 108: Travel Date: 23rd June 2021 Chicago (ORD) to Hyderabad (HYD)
Flight: AI 107: Travel Date: 20rd Aug 2021 Hyderabad (HYD) to Chicago (ORD)

I raised multiple request through email and through their portal. Did not receive any update.
Ticket opened through online is #52951 (on 5th Jan 2021).

Thanks and regards
Arun Prasad Mandava