Air India — Refund is not made after more than 1 year of ticket cancellation

Its been a year, Air India is not refunding 4 tickets price, around $4000 yet, It was told to me by Air India that the ticket status is shows as refunded and they don't have any action and asked to contact agent. Agent confirmed that I have to directly deal with Air India as the amount is directly taken by Air India. I have reached out to Air India's feedback team, ecommerce team and refund team but the response if "you response is initiated as of May 21, 2021. Appreciate any help to get the refund done as soon as possible. Thanks in advance.