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Hi @ruthie77,
Welcome to the community!
We're glad to know that you're considering to upgrade your NBN Plan.
We did an article that you may find helpful, see this link, Changing NBN Plans through My Account.
Should you need further assistance, feel free to search community for help or chat with us at https://www.tpg.com.au/support/contact/ and we'd be glad to assist you.
Regards,