Hi Renee,
I have confirmed that it's the TechColour branded modems that was not able to pick up the WAN signal via the internal wirings. I have tested with 3 other branded modems Netgear, Netcomm and ASUS and they were all able to pick up the WAN signal instantly allowing me to browse the internet without any issues.
The issue now is that my NBN has been disconnected since 24th August because I decided to use a byo branded modem and the home phone line changed from next generation to IPPOTs.
So far my Internet service is still disconnected. I have someone looking into this issue and hopefully by tomorrow, after 5 days wait due to a new order (probably 3rd or 4th order now since the Internet got disconnected), the service will be back up and running.
I will keep you all posted.
Rox