Indigo Airlines — Flight/Refund for the flight ticket

This is in regard that i have booked a direct flight for my father & brother from dehradun to mumbai on 25th may 2020 with pnr number egslsc.
It was really urgent for the two to come thats why we booked the flight immediately when the flight resumed.

But the flight got cancelled, then we again booked a ticket for 2nd june 2020 with pnr number fmpjmn. It was a via flight from delhi. Whereas dehradun to delhi flight was working, delhi to mumbai got cancelled.
We were really pissed & i spoke to senior executive of indigo mr rohan & senior exectutive of goibibo mr rakesh.
As there was no other flight of indigo was operating till 8th june 2020. So i asked for a full refund. Indigo refused paying full refund. I told goibibo to book my flight through another airline, they said, they are bound & cant book in another airline.
After huge discussion, i finally agreed to take a direct flight on 8th june 2020. Now, i have got to know that this flight is also cancelled.
Indigo flights to mumbai are all getting cancelled. Indigo says we will deduct 3.5k per passensger. Can respected authorities please tell me what is my fault in flight cancellation. Because of indigo's policy, i cant use credit shell to book ticket from another airlines.
Indigo is taking advantage of customer's vulnerability & that too in these difficult times.
What will i do of credit shell. My father & brother are stuck in dehradun. They need to get back home.
And, because of indigo's worthless policies, it is being really difficult for me to utilise my own money.

I request the authorities to kindly refund my whole amount asap. So that i can use it to get my father & brother back home.
My father & brother are stuck there.in these difficult times, with every passing moment, it is being really difficult for them to stay away from home.
Goibibo doesnt intervenes & says they cant help it.
I am badly stuck. Kindly get me full refund. Please help me.