1) Login to your client area - https://quantumcore.com.au/clients/clientarea.php
2) Select Services > My Services from the menu items
3) Click on the service you'd like to cancel
4) Click "Request cancellation"
5) Enter the reason, select when you'd like the cancellation to take place and click "Request Cancellation"
Your service will now be cancelled on the designated time.
Please note: If you did not mean to place a cancellation request, please reach out to support ASAP to avoid data loss.