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Hi, @wilsonhuang1 . The 30-day cancellation notice is listed within our NBN Service Terms, which you can find using this link: https://www.tpg.com.au/terms_conditions/nbn
These terms can also be found at the bottom of our NBN page. You would've also agreed to them when signing up.
You'll find the 30 notice period in section 13 of our FTTB terms, found here: https://www.tpg.com.au/terms_conditions/fttb
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