Welcome to TPG Community!
I've managed to locate an account and based on the result of the remote test we ran, your modem is not connected to our server that is why there is no internet access.
We will need to configure your modem with your TPG username & password. I can organise a contact to be made from our Technical team or you may follow the steps on the links below:
ADSL2+ Modem Guides
Connecting to a Wireless (Wi-Fi) Network
If the above steps were not successful, you may send your best contact time & number via private message so I can organise the call back for you.