GoAir — GoAir is not refunding money and not picking call

Our GoAir flight from Mumbai to Bangalore was cancelled during lockdown. They told me that they wont be refunding the money but i can change the sector and the date anytime within 1 year. Now i have been trying to call their customer care for more than 2 weeks, but no response. They are not responding over mails also. I have been on a call for more than 2 hours, with no response. This is not acceptable at all. Please take immediate action on GoAir. They are cheating the customers