GoAir — Flight got delayed missed my connecting flight and need to pay extra amount

Address:	Kolkata, West Bengal, 700052
Website:	www.goair.in

I was to travel from Patna to Kolkata on GoAir flight G8606 on 1st May 2017 at 15.20 hrs. But the flight got delayed and reached Kolkata late and because of that I missed my connecting flight. I talked to the airline but they are not ready to accept their mistake and because of that I have to Rs 7005 to the indigo airline from which I was supposed to travel.

I need the airline to refund my money as it was totally their fault.