Support is by email and or on the GSB forum

Forum support.

It is recommended to post on an existing forum thread. The reason is you are likely to get faster response to your question / comment.

This is because other GSB users will be subscribed to the thread.(who are also on other time zones) Support is normally very quick to respond during Australian day hours Monday to Saturday.

Forum General support section,

Phone, skype and support may also occur.

via email