Welcome to Community!
Apologies for the trouble of not having a working service. Based on the test results I've pulled up using your Community details, the NBN box appears to be still getting a signal from the line and what we need to confirm is the light status on the router.
Is the internet light on the router blinking or off? If yes, then we might need to try and configure the router manually, if you have not made any changes on the physical set up of your connection
If you are using the router we provided which is the TP-LINK C1200, you may check out this Community article: How to set up TP-LINK C1200 modem for Windows 10
Let us know if it doesn't work so we can organise a contact to be made from our Technical team.