Sastiticket.com — non refund after ticket cancellation

I cancelled my indigo flight 6e 2376, delhi to bengaluru, journey date 22/12/19, pnr number qw2rkx and booking reference prl0adxtupj. Cancellation date 20/12/19.
I'm yet to get my refund of remaining amount.
I got my cancellation done through the indigo airlines helpline and i was told that amount has been refunded to sastiticket deducting cancellation fee.
Please expedite the refund process