NAB tell you that they cant do something then they sometimes backflip.
Why you'd deal with someone who cant be straight with you to begin with is beyond me - we get people leaving just because they cant trust what they are saying. End of the day (and we say it over and over again) its not all about rate - its about product, portfolio management, risk exposure, structure... etc etc etc.
One thing i'd wonder - out loud and I'll admit I dont know... but while its great to put pressure on the bank to get a better deal - i wonder if the overall culmination of these is why the lenders did those 'little' increases, or a percentage of, which ended up impacting everyone with a loan.
I.e. did the culmination of all of those .8's-.9's stress the margins a bit 'too much' with everyone wanting a better deal? After all, every action does create another reaction somewhere down the line we may have screwed ourselves without knowing it (which being banks I would expect could happen). I dont think anyone REALLY knows for sure but I wouldnt put it past them.
Now I'm the first person who wants a better rate but any bank or broker etc who is selling purely on rate is doing so because they dont have a hell of a lot more to offer
And soya, forgive me but owing $1m isnt hard to do... and the reasons you should be looking to diversify out of NAB would be not just rate but also a factor being the removal of the likely X Coll they've got on you and your portfolio.