Air India — not getting my refund!

Hi, actually i don't know how and whom we can request now to get our refund as we booked one air ticket to air india from usa to india for my nephew and right after a day they have announced the lockdown and all international flights got cancelled. Now my nephews college is closed and he is alone there and wanted to come back to his family but, he tried to ask them to adjust the ticket amount to another which he wants to book for his self and the ticket amount is around 52k then they said to ask for refund and make the fresh tickets, i mean seriously who has such money throw as we are asking to get the refund since last month they are not even responding back, don't know what to do now, i am sending this conversation for your reference as it's second time in 2 months we have made request to air india to refund our money.
Hi airindia team,
The refund has not been done yet. Kindy revert on when this amount will be refunded. Kindly do the needful immediately as he will travelling back to india soon.