Hi jimnguyen1981,
I could advice you to try to contact our representatives however our centre is not wokring at full capacity.
You can also try to do it online,
https://cyberstore.tpg.com.au/your_account/cancel.php
Just remember the terms of conditions https://community.tpg.com.au/t5/Broadband-Internet/cancellation-fee/td-p/35067
