I have been in a similar predicament where there is a very pervasive PTC-type traffic coming through. What I mean by pervasive is the traffic first hits my site from a link on the bad neighborhood site, and then continues through my site clicking lots of links including adsense, often clicking 10-20 levels deep and hitting other sites that also contain my adsense.
I sent two different messages to adsense a week ago after my earnings grew by $300/day. First I didn't know what to do, and was studying the behavior. It took me a couple of days to realize the traffic was some kind of bot. I have now blocked referrals, at least about 99% of them, though they keep creating more subdomains that I have to then block.
I hope google adsense will see that I have taken appropriate steps. It is unfortunate that a week has gone by with no replies. I'm pretty sure this site in question is generating thousands of dollars of adsense clicks per day. I can see the site itself has adsense disabled, but the pervasiveness of the clicks are surely generating a ton of clicks elsewhere.