New modem will not connect

I recently started my service at the current address in Lynden, WA and followed the instructions that came with the modem. However, I can't seem to get internet because my LED lights keep flashing on my modem. I have tried power cycling, connecting to a different coax outlet (to check if there was signal there), and chatted with the Xfinity Chat Assistant all without any success. I honestly don't want to pay the $100 just to get someone out here to fix it within five minutes. I have been able to follow all the instructions that I was given so I don't believe that it was my fault that I am not receiving internet service to my home. I also have had the service for almost a week but I have not been able to use it at all. Can someone please help me? I have to go back to work (remotely) and I need to have a reliable internet service ASAP and this is just frustrating. Thank you all in advance for your help!