Indigo Airlines — refund full amount due to cancelled flight

I was booked flight from nagpur to bangalore with travel date 10 april 2020 and bangalore to nagpur with travel date 15 april 2020. But due to lock down flight was cancelled. But they have not refund full amount. When i initiated the refund request, they told you are not eligible for refund. I want full refund amount of my booking. I request you to help me.

My booking id :- emt70056035

Pnr no.- mq9vhr & xqiu9r