Welcome to the community @kwyung
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 Fibre to the Curb (FTTC) Setup Guide
We have also created setup guides for all technologies that TPG use : New Connection Setup Help
In your case, our NBN provisioning team tried to call you in order to check your NBN FTTC setup. You may contact them directly at 1300023575 or advise us via PM with your preferred time and best number to be contacted.