sanyooooook, look for someone else sitting on your IP. Unless, of course, you've been downloading something in bulk yourself. But that doesn't sound like you. We'll look into it.
I had the same situation three years ago. From the same IP in the company where I worked, another person supposedly came here and downloaded a lot of content. I was autobanned by IP, not by login (I logged in at home without any problems). It was sorted out.
Not people who will answer why I got banned? sanyooooook