I'd love to help check the status of the newly installed service, usually this happens when modem failed to perform self-configuration. Drop me a Private Message with your account details (Username/Customer ID together with the address on file).
You may also check the correct installation setup of the modem here, List of all TPG broadband setup and modem guides on Community.
Let us know how it will go.
Since it was installed on 18th of January and said internet already connected but it is still not working and saying it will automatically configured for 30 mins but it is already nearly 3 days still not working