The direct QR AKL - ADL flight is stopping in Sept, from Sept onwards, the QR flight will go back to flying direct AKL - DOH.
Then its back to AirNZ for the direct, without a J cabin.
First world problems, personally, I would take it as a learning experience.
Let it be, worst is that if you argue, they might call airport security on you.
When it comes to airports, even if I have been wronged, I don't say a word.
Eg: a long time ago, my JQ MEL - ADL flight got cancelled, I just went to QF desk sales and bought a flexY tix back to ADL, in the end, got SC from the JQ flight, even though it was cancelled on me (!!!), and also the flexY from the QF flight I actually flew.
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If your BP showed VA VFF #, of course the QF person would say no.