Travolook — Didn't refund my money

I booked a ticket for my parents from Bangalore to Patna on 11th june and after 30 mins I received mail that the ticket was cancelled due to operational reasons. Till now I keep on asking for my refund and replying the same will get a refund within 5-7 days. Please do the needful. Thank you
Booking Ref - REF[protected]