I'm in the same boat. I picked a bad time to sell up and move house. Now I've been a week without internet and cannot get an answer from TPG about what on earth is going on, not even via the online chat. It's like the whole company has just shut down and nobody is actually working from home (and if they are, they haven't got a clue how to handle the online chats; if you're not there to reply immediately they'll just close it and move on to the next one... it's appalling.
For customers who would like to check the status of their service installation/activation, we have created this community article, which contains a video on How to track your TPG service installation
We also send an email notification once the service is activated. If you have received this email and the service is still not working, we recommend to check if the equipment is properly set up by going to this link : NBN Hybrid Fibre Coaxial (NBN HFC) Setup Guide
In your case, we've notified you via Email in regards to the installation of your NBN HFC service.