GoAir — refund (go air cancelled the flight)

Hi,

I booked a flight g8-805 (Go-air) on 6th jan and then i rescheduled the same flight for 3rd jan.
Go-air canceled the flight and now refusing to refund the rebooking amount.
My question is when they canceled the flight, how can they hold the money.
Upon further investigation, i came to know that they canceled the same flight till 17th jan (As my friend was taking the same805) flight.

This is fraud