I'm sorry to hear that your internet is still not working. Based on your description on the issue you are having a No Sync problem wherein your modem is not detecting the signal from the exchange.
The cause of the problem could be something physical such as a cut or disconnected wire outside, phone sockets not working, loose cabling, etc.
Some basic troubleshooting can be found on https://tpg.com.au/support/problems_connect_internet_standalone.php
It is also worth to check if your phone has a dial tone or can make and receive calls.
I tried looking for the account using your registered details here but I am not successful in this. Can you PM your partner's TPG account details so we can personally check?