Bitcoin trading is unofficially banned in New Zealand and Australia.
If you want to buy bitcoins, and had wanted to pay a seller using your bank account via internet banking or online banking – to transfer that payment, your account will likely be monitored then abruptly closed down. This is similar to what Paypal does when they shutdown accounts of ANY suspicious activity they deem fit.
Bitcoin protocol is being monitored. Hence even if you did not buy directly using online banking, chances are your MAC address are already tracked, logged, and filed for future checking.
If there is such a thing as VAULT7, then there is surely VAULTNZ or something like that.