Here you go: https://www.google.com/adsense/support/bin/request.py?contact_type=invalid_clicks_contact
I wouldn't if i was you. They could just as easily ban you after looking into your account. Even though you're reporting it, i've heard of this happening before. Just forget it. May i ask how you came to the conclusion that they are fake clicks?
how do you know they are invalid clicks? even if they were invalid clicks, no worries as google will filter them out anyways. if you have been victimized of a click bombing, then you must contact adsense and report that. but for few extra clicks or invalid clicks, no need to bother unless you hear back form google (given that you had nothing to do with the fake clicks)
You have got some fake clicks.How did you do that and why? Forget it and dont do it again.You should be honest.
Google is wise You don't need to report these kind of stuffs, they know what's the difference bet. valid and invalid clicks. They won't ban you for these scenarios.