You need to make sure that those ppl are in your userlist. E.g.:
300:*!*@John.com
99:*!*itsme@Mary.com
100:*!*hi@Paula.com
and so on. That scriopt will only match the ppl that are in the Userlist, so, if John is connecting from Matt's place (*!*@Matt.com) it will not work.
Another way is to block nicks, but that isnt very accurate, since the person can just change nicks.
To add a user: /auser <level> <mask> [info]
Edit: Also landonsandor has a point
You're missing some spaces.
Hope this can help!
Zyzzy