GoAir — refund for air ticket (go air cancelled flight)

Goair cancelled their flight for 17th jan 2020 g8-404 with a one day notice. The notice stated that if we want to get a refund or change of flight, we should call on their contact number. Haven\'t been able to get in touch with them on their contact number from the last 15 days. Also no amount is credited in my account for the flight which they cancelled.