Flight Cancelled Last Flight of Day - Not reimburse Hotel Costs to stay night in Sydney as result of Cancellation

I was on a flight from Syd to Melb - last flight of the day. 1hr before flight due to leave Jetstar cancelled the flight and put me on a flight to Melb the next morning. I had to quickly try and book a hotel for the night in Syd which cost $200. Before I made the booking Jetstar told me they would reimburse Hotel costs up to $150 but that they would not reimburse until after I had taken the flight home to Melb.
3 days later I went on line to lodge my claim for $200 hotel costs only to be told via a online assistant that Jetstar would not be reimbursing any $ for my nights stay in Syd.
This is dishonest and rude way to treat your customers. I will never fly Jetstar again and I will tell as many people as I know about this experience which is diabolical. They should be doing a govt enquirer into Airlines rather than Banks - the ethics is unAustralian!!