Last year a neighbor had a comcast tech who identified a noisy signal somewhere on our block. He proceeded to disconnect every other house on the block and then left.

He never told anyone at Comcast or the other houses. Took hours of battling with phone support and a two day wait to have another tech who came out and identified the problem. He said they do this often to get into houses to find problems but he's supposed to put a note on each door and put a note on our accounts. Whoops.