Air India — Refund

I have booked for 3 people tickets from ATQ-DEL-VIE in March 2020, the flight was cancelled due to covid. i have called, emailed multiple times and never received any money.
So many times they told me to wait 25 days, 21 days, few weeks, no money ever came.
Its really tiring. All i want is my money back.
Another thing is I have called the customer service, they tend to lose connection or hang up in the middle of the conversation, too.

like i said its been over 2 years now and i didnt not get any money back!