For a speedy result, check out the below links before contacting support:
View the Network Status Page to see if there are any server level events that may be causing your issue.
Check the server firewall via the Unban Center to see if your IP may be blocked on the server Firewall, you can also choose to clear any blocks.
If your site is producing an error, it can greatly speed up the support resolution time to provide Hosting Australia with a screen shot of the error. Please view this page for details on how to take a screen shot.
You can then upload it via the option below.
Please provide any further details you may have that are relevant.