GoAir — goair cancelled flight and no refunding money

I booked flight ticket for blr to pat in go air on 4th of june 2020. Travel date 13th june 2020. Pnr c78j3j, fare 9562/-. Goair cancelled my flight on 12th june night. I asked for refund as the flight is cancelled by goair but goair is not responding. I tried calling customer care number but no one is responding. Sent multiple messages on twitter but without any luck.

Please help to refund my money.