What if I have faulty coaxial cable

I'm trying to install Xfinity home internet via the Xfinity app, but I encountered an error: 'We couldn't find your gateway.' I checked my cable up to the electrical pole, and it seems to be fine. I even tried linking the Xfinity router directly to the 4-way connector located on the nearest electrical pole, but I still encountered the same error. I suspect there might be a break in the coaxial cable somewhere. After the electrical pole, the coaxial cable crosses the street, and I cannot check it further. What should I do next?