Spice Jet Airlines — non refund of booked flight ticket

I have booked the tickets for my younger brothers marriage through yatra on spicejet (Reference pnr: kivlyr, booking id:[protected], but since airlines are only providing credit shell options, but these will not help in the current pandemic situations. I have enquired through mail but the travel agents claim airlines are not offering the refund. The total booking amount for this ticket is rs: 13259.72

Please help in this matter to refund my amount to the source account.

Regards
Viveksamuel i