I think the jealous person doing fraud clicks and attempting to ban your account. Remove your ads from here.
I was a similar victim of clickbomb. My competition was clickbombing me i guess As i was leading the serp position on google for a very profitable niche. U can just find the ip address of the clickbomber from your adsense account and ban it . then do write to google about this in a very professional way. your site should be legal and should pass manual review if they do . Also remove your adsense ads for the time being till google replies to you back. this shows that you are concerned about your adsense account and you dont mind to lose a couple of $$ . The above steps need to be taken if u have written about this to google since i have known many people and friends who were clickbombing victims and when they notified about this to google ...they inturn got banned . so please heed my advice ....though i am new to this forum wordpress+adsense+marketing is very very old for me.been this industry for over 10 years now..