Air India — not ready to refund my air tickets amount

I had booked 4 tickets for del-goa-delhi (21mar -25 mar). Tickets no[protected], 52, 53, 54. Due to corona we drop the plan and canceled the tickets but they are not ready to refund our money till date even after changing their policy again and again. I am requesting that whatever your policy give my amount but they are not responding our calls after waiting long time in queue and emails as well. I am really hopeless in the time of pandemic as need money very much. Kindly help.