Well, If google contacted me for invalid clicks, how can I approve that i wasn't responsible about these invalid clicks and someone frauds my ads I mean what should I do when someone click many times on ads on my website. I am using cpanel where I have awstats, is this considered as Official tracking system??
No! AWStats is not a proof at all. In most of the cases if google cancel your adsense account, you are not going to hear anything back from them
is not as easy as it sounds. i know people protecting their accounts like money in the safe. i dont remember the name of the stats script now. but i know there are many. just google adsense stats counter and you will find many options. but none of them are official. Google guys have the end say in this. so try not to harm your account in the first place.
Dont ever relay only on google. They searching for every loophole to cancel accounts. I think there goes a large profit to google if one account is cancelled. There must need a technology on adsense to not show ads repetedly on a long time for a single IP. They can implement this easly. But they will not do it, because this will largely affect their favorite cancelling program.
Try Adsense Gold. They have an Adsense tracker, which is valid for screenshots. I would bother with Joel the noob's one, as it costs monthly, and doesn't look as nice.
I use Adlogger and it's fine it detects ip of clicks and you can ban your IP from even seeing ads on your sites to avoid clicking on them by mistake