I can't help your situation; you probably need a Google employee to take a look and your best bet of catching the attention of one is on the AdSense Help Forum.
But as far as invalid clicks - that's a broad term that doesn't necessarily mean *you* did anything wrong. It could also mean that you experienced some unusual traffic (I sometimes get a rush of traffic from China on my Michigan-themed site that seems to click like crazy - and probably gets written down as invalid) and it could even mean that the advertiser defaulted on paying for the ads. So they're not necessarily accusing you of anything nefarious.
That said, there was a bug in August where some people got that 0.00 in earnings message (I was one of them) and it took Google till the middle of the month, but eventually they corrected it. So I wouldn't give up yet, but go check on the AdSense Help forum, in the Payment section, and see if anyone else is complaining about this. And add your voice.