GoAir — No rescheduling of cancelled flights during Covid

I have booked ticket from Delhi to Mumbai on Go air scheduled flight on 29/03/2020. However, due to Covid 19, all flights got cancelled and our PNR was saved for booking at later date till one year.

Now, i am trying to reschedule my flight but under "Manage Booking", no flights are visible against my PNR (Q51HMV).

I tried contacting helpdesk[protected] / +[protected] but no body picks despite multiple calls at various times.

Request you to intervene and help me in booking my ticket.
This is not good from Go Air to not give option to reschedule the flights.

Please help as soon as possible and revert.