Go First Airline — Delay of 4 months in refund

I was booked ticket from Jammu to New Delhi. The flight was cancelled in sudden and no proper arrangements was done by the airline agency. After of this it had been more than 4 months the refund of Rs 7576 has been not approved by agency.
Many time take follow up from customer care, but always I got monotonic answer.
Very bad experience and I will not prefer to book any service with Go first.