GoAir — No refund for ticket cancellation by the company

My flight with pnr - a6p9fm from bengaluru to mumbai scheduled on the 6th of june in which i had booked 3 seats got cancelled because of "issues beyond out control" as stated by goair. For full refund they asked to contact the customer care but no body has been replying to there calls. The flight was scheduled on 6th of june at 8:45 am and because o[censored]rgent need to reach mumbai, i was forced to book a train instead. I demand full refund for my tickets.