Green Ground Wire From Cable Line Outside House

I recently had my electrical main panel redone and the panel was moved to a new location for code compliance. I noticed after the electricians finished, there is a green ground wire that used to attach to my old main panel that is now just hanging around. It looks like the ground wire is spliced into the main line just right before the cable line enter the house. I am wondering if Xfinity is the one I would contact to have the ground wire reconnected and who do I have to talk to for this to happen?