Well, having taken a look at the ban list, you aren't on it and haven't been. So that means that every time you have tried to log on for the past six months, you have done so using an IP address that has been included in a ban filter. So the questions would be, do you access at home, or work. Are you accessing via a university, or other LAN? Who is your ISP (if accessing from home)? Have you moved recently?
A lot of questions, but without them, we won't be able to track down which filter you've been caught in.
Ive been trying from the 3G on my phone and at resturants ect as I havent had the net. I recently got a landline internet connection thing and it seems to running okay for now.