Air India Express — refund of cancelled flight ticket amount

I had booked a flight ticket with air india express for my sister in law to travel from chennai to singapore vide booking ref pnr: blzljd to travel on 05.05.2020. Unfortunately due the pandemic situation the airlines had cancelled the flight which was scheduled on this day. Later on the guest travelled by an repatriated air india flight on 21st may 2020.
As the air india express did not refund the cancelled flight ticket amount, i started corresponding to the customer care from 16th may 2020 and till now at least ten mails have been written to the airlines and for each mail a standard auto reply “we are experiencing very high email and call volumes and seek your understanding and patience.” only have been received. As this was not the answer for my refund issue, i had sent an email to the next level of grievance handling person “the nodal officer”. Let alone any reply, there was not even any acknowledgement for my email dtd. 22nd july 2020. As there was no response from this responsible person of air india express, i sent an email on 24th aug 2020 to the next level of this grievances handling person ”the appellate”. These two higher level officers have proved that, they are from a public sector unit which is a government agency and do not have time to bother on these kind of issues!
It is nearing six months now and still the airlines has not bothered to refund the cancelled flight ticket amount. And this is how the government agencies in india have made big haul of money during the pandemic from the people who are severely hit financially. It is high time that, the honourable courts in india should register a suo moto cases against these government agencies for this day light robbery. I am taking up this issue with the ministry of civil aviation, govt of india for speedy disposal of this issue.