Air India Express — Cancelled tickets refund amount not paid even after 3 months after cancellation

On 1st AUG 2020, We cancelled air india express flight tickets (total 3 tickets which includes mine, my wife and my daughter ) from Chennai to Singapore with PNR no:EFCGGU.As per cancellation policy an amount of Rs.64700 /- to be refund to my account and so far the amount not refunded.I keep on calling the customer care (approx. 20-30 times) and texted in social plat forms(like Facebook page of AIX and twitter page of AIX) and so far their reply is “we will look into it soon”. More than 90 days passed and I haven’t received the amount in my account.The amount is really huge in this pandemic time.I am a middle class man with lot of commitments .Pandemic already destroyed my savings and this refund amount is a huge to recover from my loans.Please do the needful. When I searched in Twitter there are hundreds of people who are suffering like me.