This is actually my experience too. A "friend" downloads a movie lets say, and for about 12 hours afterwards their connection speed is throttled in an apparently retaliatory gesture. Not so far fetched if you consider that the ISP has been recently been acquired by a conglomerate with media interests ...

Said isp has been "only show in town" for serious internet access for some time so thankfully that is starting to change so a move might be on the cards.