Sastiticket.com — did not get the refund for cancelled flight

Website:

sastiticket.com

I have a booked a ticket from guwahati to kolkata through sastiticket.com.

Unfortunately the flight was cancelled by the airline (Jet airways) itself. My flight was scheduled on 11 february 2019 and the flight number was jet airways, 9w-676. Booking reference number: prl07eoo6mv

Since the flight was cancelled by the airline, i am eligible for full refund of the ticket. I have also confirmed this with the airline office.
I sent an email to sastiticket guys and also called them for hours. However, i did not hear back from them and didn't get my refund back.

I have started to think this website is fraud. If i don't get my refund money back, i won't hesitate to take a legal action.