Get online support
Hi there Cameron,
Welcome to the community,
Yes you can do this easily online i will provide you a link below, if it appears to be giving you an error of any sort then maybe give it a short while and pop back in and try little later.
You can change your NBN plan online by following the steps at https://link.tpg.com.au/StRerw
Any further questions or concerns let me know
kind regards
kind regards