Electric Bill

I was opening the mail last night before bed and we got an electric bill for the old house. ComEd billed us for $370 for four months on a house that was EMPTY the entire time. Not only that, but it wasn't the final bill we were supposed to get! It says "Final bill" at the bottom, but it was an estimated read from the day AFTER we closed on the house! ARGH!! I have a very hard time believing that ComEd would have ANY customers if they weren't a total monopoly. I don't know ANYONE who would use them if they had a choice. This just reinforces their willingness to abuse people in my mind!