For customers experiencing any issues with their service, we recommend the best thing to do first is check if there's an outage affecting the network.
Check our Service Status at http://www.tpg.com.au/servicestatus for any known outages.
If you're on NBN, we have created this article that can guide you on How to Check for NBN Network Outage
If there are no known outages in your area, you can proceed with the troubleshooting steps indicated on this linkhttps://www.tpg.com.au/support/problems_connect_internet.php
We also recommend having a read of these community articles, which may help resolve your issue:
In your case, we have identified a Telstra Network Outage affecting the service and Telstra will aim to restore this as soon as possible.