Well, Notify Google about the Invalid Click activity. If you doubt the clicks are from DP, Why do you act Fool enough to put the blog still in your Signature and tell all that my blog is in the Signature? Well, if the click activity continues, Remove signature and all the links of your site you may have put in forums or so. Find the IP of the person from the visitor Log and ban his IP. Report to Adsense With His IP so you wont be screwed. Thanks,
That is why one should never post their website(s) on DP, otherwise you are just asking for trouble if you annoy someone here. PM would never do that though. He is a good boy, a real good boy.
Adsense can't ban you for people click-bombing you. If that was the case then I'd pay people to click on my competitors link ads just to ban them.