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Personal
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Mobile
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Small Office
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Internet
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Other Services
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Business & Enterprise
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- Wholesale
Get online support
Login to your account at https://www.tpg.com.au/home/myaccount
Find 'Change your Plan' and do whatever is necessary from there.
If you can do it from there, I think it is more preferable since the support team may take a long time to respond to you.