We booked business class Brisbane to Honolulu via Sydney. On return journey delayed 3 hours in Sydney due to weather. Whilst we were waiting in lounge for our flight we got called to proceed immediately to gate. We had been put on an earlier (also delayed) flight.

At the gate we where told that no business class seats and we will be sitting in economy but they will arrange refund. Asked if our bags were on the plane and told possibly... Anyway got to Brisbane and bags were not there. We lodged baggage claim and they arrived the next day.

Qantas never called, and after a week called them. Told they couldn't do anything over the phone, have to lodge a complaint online. I did this two weeks ago. Still no contact so called them again and was told that they had credited 8000 air miles.

I advised that I would prefer a cash refund for the ticket class. Was told that there was no cash difference on my ticket as was its calculated from Honolulu to Brisbane and we had flow most of it business class?

Is this fair compensation for the downgrade?