@ntsa: referring to germany isps:

if the attacts you registered from germany were coming from networks like t-online.de, t-dialin.net or anything like t-something you wont even be able to change anything. (same goes for hansenet.de)

the german telekom has millions of users and clients all over the world. the will not react and response to your emails and probably not even trace the little hacker......... almost scripts-kiddies-paradise