Jetstar, NEVER again

Jester - sorry that should be Jetstar (or should it?): I will NEVER, EVER fly Jetstar again:
Five of us travelling to Vietnam for an organised motorbike tour (obviously on fixed dates).
1) Some time after original booking Jetstar cancel our 4.5 hours direct Darwin > Vietnam flight and replace with 18 hours (elapsed) via Singapore. So, we change all other connecting flights and hotel in Saigon.
2) Then a few weeks later this week they inform me that they have cancelled ALL Darwin > Vietnam flights for the day we were to be travelling - we'll have to travel the day before. Plus our connecting flight to Darwin from Broome no longer connects and we lose money on that cancelled booking (no refund available) plus have to buy another ticket with another airlline. We will now spend an extra day in travelling to Vietnam (now it is 3 days elapsed!).
Oh, but Jetstar do tell me they will not charge me for changing my flights!

International
Australia-Darwin
Vietnam-Ho Chi Minh City