Air India — No Refund of cancelled ticket

I have booked the flight ticket through Air India website PNR HEQ12 Reference E Ticket no[protected] for March 2020 in February last year. Due to covid-19 lockdown flight got cancelled. I called customer care and also send multiple emails to [protected]@airindia.in and requested for full refund as i am eligible for full refund as per government guidelines. Every time, I got a response that it will be refunded back to my account with in 3-4 weeks. Its been more than 16 weeks now in a row since i requested for a refund. And still there is no update.