For customers who want to reschedule the installation appointment or check the status of the service installation, we have created this community article for reference.
In your case, there was an issue with the NBN system that did not allow us to reschedule the install appointment.
Nonetheless, the original appointment has been completed and your service has been installed/activated. Our record also shows that you have received the TPG Modem and you can proceed with the connection set up to get an access to the internet.
You can refer to this guide : New Connection Setup Help
Should you need further assistance, feel free to search community for help or chat with us at https://www.tpg.com.au/support/contact/ and we'd be glad to assist you.