Booking class totally irrelevant. They are advertising one price form Auckland and another from New Zealand, if the Auckland price is available then the New Zealand price should be available otherwise they may as well just advertise the Auckland price and we take pot luck with the price from elsewhere in NZ as per usual.
it's a real shame that no-one from NZ or a certain government department is a regular on here as I am sure they have channels to bring these things to the attention of management - or do they and no-one higher up cares?