Activate new spectrum modem

Hi all,

I sign up spectrum few  days ago and got modem today. I try plug in 1 coax outlet but it fail. The modem blinking yellow light then I moved to another coax outlet. Modem still show blink yellow and can’t get online. I chat with cs and he said that he can’t see my modem at their end. He also said that I need to request technician come out check the line which cost me $50 or sign up care plan for monthly payment. 

I wonder is there anyway to avoid the charge when tech come out?since I got charge once time service/ activate fee for $20.