Air India — Refund due to flight cancelled

Address:

554D, Railway colony, Tiruchirappalli

I had booked a ticket No.[protected]/1/1 and PNR No. Z00BH from TRZ_DEL on date of journey 15/04/2020 in lockdown period due to covid-19. Due to covid situation all flight were cancelled. And air india has announced for refund of ticket money. My Ticket money not refunded till now due to my ticket status is showing FLOWN.
My question is when all flight were cancelled in lockdown period in during of 25th March 2020 to 3rd May 2020.