Indigo Airlines — refund of amount

Address:

217/A, 2nd Floor, KVV Samrat, East of NGEF, Outer Ring Road,Kasturi Nagar

I have booked a flight tickets from bangalore to penukonda on 24.12.2019 for the date[protected] with pnr bgt* for 5 passengers. I contacted the airlines for refund as lockdown period is on. They replied that the amount is safe in credit shell which is valid for * year and compelled us to travel at later date and if don't want to travel then cancellation charge of rs.* per passenger will be deducted. It means the airlines is compelling us to travel. Please help me to get the amount refund back.