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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 this case, we've seen that this issue has been escalated to our Engineering Team and raised to Telstra due to a line fault causing the service not to work. Further updates will be provided by one of our Engineers via SMS or Phone call when it becomes available.