Neighborhood Maintenancee Issue

Two of us in our neighborhood are experiencing issues with the Internet dropping out; sometimes just enough to cut us off of conferences.  Other times for a couple of minutes at a time.  We both have 1000 Mbps service.  Each time we call they send a technician to the house.  Our services have been replaced and also lines into the house.  One tech said it's a maintenance issue, probably corrosion on an amplifier on Comcast's lines.  He said he would put in a maintenance request and didn't.  Second tech came out and said the same thing.  No maintenance request put in.  Third guy is now out at the neighbor's house when she begged for maintenance to check the neighborhood lines.

Does anyone know the direct number into the maintenance department.  It is the neighborhood lines!