Ozzy,
Honestly, the best thing to do is leave them. Your firewall seems to be doing an excellent job at keeping them out, and probably stopping them from doing a lot of damage.
If you were to send a counter attack you would reveal a lot of information about your computer which would obviously make it much easier for them to get in.
Firewalls such as ZoneAlarm were designed to keep your computer completely stealthed, to offer no counter attack and to reveal to information at all. Their aim is to make it seem as though your computer doesn't even exist.
So that's the best thing to do Oz, just leave 'em alone

Jon
