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Hi @unrepeat
Before attempting the troubleshooting steps, we recommend that you do the following below.
If you are still unable to connect to the Internet, you can proceed with the troubleshooting steps indicated on this link: https://www.tpg.com.au/support/problems_connect_internet.php
In your case, there was a fault within the copper network that affected your ADSL2+ service. We understand that your NBN service was installed on the 26 March 2020 after our team managed to get the earliest appointment from NBN Co and the service seems working within specification.
Feel free to search Community for help with your issue, or contact us and we'd be glad to assist you.
BasilDV