I wouldn't waste your time with Qantas Customer Care. I expect they are good people engaged in a very difficult job, but they will be as poorly paid as Qantas can get away with, and under-resourced. Until I told them, they didn't even have the name of the airline correct on the Qantas website (they asked people to write to Qantas Airways Pty Ltd!).
What Qantas gives you in compensation for delay in delivery of (Australian Domestic) baggage can not be less than is set out (if I recall correctly) in the Civil Aviation (Carriers Liability) Act 1959. If you're in in your home town, I think that is nothing, presumably on the basis that you won't need any "Emergency Expenses". The Baggage Services (or whatever they're called) team in my experience always do the best they can, within their individual authority.
International is covered by the Warsaw Convention and a series of amendments. There are also local laws, and there the European Union has some compensation requirements.