I've been having an ongoing issue now since purchasing a home in Olympia, Washington back in August 2017. I'm going to establish a rough timeline of events to the best of my memory. Mind you this is incomplete because I wasn't formally tracking as I didn't forsee an issue at the time.
August 16 2017 - Call placed by myself to attain Xfinity/Comcast blast internet for my property in residential Olympia, Wa (Thurston County). The individual checked, found service was possible, and sent a modem with activation kit to my property.
In my region, if Comcast already has service established at the residence, then any infrastructure upgrades they need to do is their problem. They probably shouldn't be asking you to pay for a plant extension (that's why they want an extra $1K). I'd give the corporate reps that reply to your post a chance to sort it out. If you don't get satisfaction, I'd suggest you complain to your local franchising authority, their contact info is on your bill or any phone rep should be able to give you the info.
I've asked a Comcast employee to help you. You should expect a reply in this thread.
Hello ackerj71, I can address your serviceability concerns here. Can you please send me a private message with your full name, street address, and account number by clicking on my name (ComcastAmir) and then "private message me"?