It's curious that HSBC Australia would write one thing on their website but tell people something entirely different in person -
HSBC Australia Savings Account
The following rates apply to the HSBC 'Serious Saver' Product and you will get the following interest rate for every month you do not withdraw. However interest will not be payable for any month where you have made a withdrawal. Deposit amount range - $1 - $1,000,000
APY = 3.15%
According to HSBC Australia's website, they're giving 3.15% on any deposit between $1 and $1 million.
But, I'll take your word for it and give them a call anyway when I get the chance.