Book My Yatra — Unable to use credit shell amount

I have made two bookings with yatra.com on respective pnr's (Mgywpf, qfu5jv) from hyderabad to varaanasi to and fro on 13th march 2020 obviously due to lockdown and covid crisis flight got cancelled and instead of providing refunds the airline provided me credit shell of rs.21000 now when i'm trying to use the credit shell i'm getting following pop up message (Refer to screenshot). I have been trying to contact yatra representative through mail, whats app but as usual no reply from their side yet. Finally i have no other option rather to raise complaint on this forum. Also although the screenshot suggests to wait for 2-3 days to get the refund from airline but i've been getting the same popup message since last 2 weeks while contacting the indigo airlines they have told me the entire refund has already been transferred to yatra.