Are you ADSL or NBN? If NBN, what type?
What model router do you have?
If you have ADSL, there is one lead from wall socket to the router. If you have a landline phone, there is also a filter/splitter connected.
If NBN, there is the router and probably a NBN connection device.
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
Should you need further assistance, feel free to reply to this message or chat with us at https://www.tpg.com.au/support/contact/ and we'd be glad to assist you.