I'll flag your post so hopefully you'll be first on the list for tomorrow.. From there I'd imagine they'd be some communication via here, private messaging ect.. Hope you get it sorted.
Hey Damo, is there anything unusual about the charge? Feel free to PM me more details.
Has your problem been solved? I have the same problem with Optus. I made phone calls, went to the store and did online chat. None of them gave any solution but kept leading me in circles.