Just found out what went on with the quota, my ISP is conceivably doing something illegal here. The data hoarder seems to be Netflix, while I checked just an HD 5.1 movie, it consumed 2.4GB in just half an hour. That is nowhere near what it should be, all sources say an hour of HD content should be up to 3GB. This must be done deliberately, as my ISP just so happens to have an attractive unlimited Netflix add-on...