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Hi @Azim1
We've managed to locate your account and tested the line.
It shows that the router is not communicating to the NBN server due to incorrect configuration.
We've created an article that will guide you on How to set up TP-LINK C1200 modem for Windows 10. (Even though you don't have a Win 10 computer, you may use the article as a guide)
Let us know how it goes.
BasilDV