Cancellation and no refund

My two daughters were booked on return flights Perth to Melbourne. Outgoing flight was cancelled. They were given a few options and then after initially deciding to cancel and refund they were told there was another later flight to Melbourne. So they were booked in to that. However the really smart assistant still cancelled their return flight. They had to pay for another flight back plus extra for baggage. Two Uni students out of pocket by about $270 each. Poor show Jetstar.

Australia-Perth
Australia-Melbourne - Tullamarine