cancellation of flight without notice

On the 10th May my return flight from Bali JQ38 cancelled even after re-confirming my return flight from Bali Jetsstar office.
Offered alternate route via Darwin to Sydney same night. Accepted. Had to pay $ 264 for two extra.
Trying to claim extra money paid. Not sure whether I will be successful.

International
Indonesia-Denpasar (Bali)
Australia-Sydney