Quick answer:  If you need to check your usage, simply login to Australia Broadband Online and head to Usage

Usage on Australia Broadband Online

Login to Australia Broadband Online and head to Usage. This will show you the usage for the current month. 

Usage is not in real time and it can take up to 1-2 business days for your usage to show on Australia Broadband Online.

You can also click on the usage data for a specific day to show that days usage, or click on Download or Upload to view only Downloads or Uploads.