You really need to ask the admins at that network what is going on. If you dont know the network's website, use
www.google.com to find it, and look for info or a forum there and how to contact ppl who can help you. Be sure to include the entire akill msg you see.
Its possible you arent the offender, but that others within your ip range or with the same provider are the cause, but only the admins of that network can tell you.