Go First Airline - Flight canceled by Go First but no refund in 1 5 years

Hey Team,

I had booked a round trip ticket from Patna to Bangalore for **th May ****. The return ticket was booked for **st May ****. The total cost incurred for the ticket was INR *****.
The first issue is that Go First did declare about their bankruptcy just * week before they started canceling their flights with no information until the last moment that the flights were getting cancelled. Due to this I had to book my tickets from Indigo airlines and the total cost for me to travel to Bangalore became approx **k.
Due to the mis-management from Go First, I had to spend **k extra. On top of that my ticket amount is still not refunded. I want Go First to refund my money at the earliest along with the interest applicable for the last *.* years. A *% interest charge should be applicable on Go First for the refund. **k might not be a big amount for Go Firs but it certainly is for me.
Can you help me get the refund from them?