Can you please share what script you are using, to fight those who intentionally click ads in your site. For example if the said IP already click the ad, the adsense ad will not show any more when he or she go back to the site. It will display other ad that is not adsense anymore.
This is nothing to worry about I used to see ip clicking 15-20 times with different ip daily for about a week, I didn't report it to Google and still ok. It's been a year already.
I reported it, and they said they will do an action of it, but they said they can't ban the said IP, because they don't have that power to do so. The problem is that the one attacking seems using lot of IP address I have deny 10 ip already but still getting illegal clicks