This article shows how to place a cancellation of a service through the customer portal.
Log into the customer portal at https://mysau.com.au
On the dashboard, scroll down to products. When you see the product you wish to cancel, click the 'eye' symbol on next to it on the right
Click the cancellation tab
Enter a reason for the cancellation, accept the terms and conditions and press submit
The server will now automatically cancel at the end of the billing cycle.