Go Air — no action on cancelation of flight by airline

Address:

Plot No. 15/11, Gali no. 11, Gangapuram Near Shivalik Hoapital, 201013

I booked a ticket on 5 dec 2019 from del to nagpur. Flight no g8-2519 dated on 16 jan 2020. But unfortunately i received a msg and computer generated call to regarding cancellation of of flight on 15 th jan. 2020.
After receiving call on morning i tried to called and contact airlines. But the didn't response. No body has picked the call.
They have not provided any alternative or refund.

I have mailed them 2 times for refund but no response. I have receive only acknowledgement mail.