You can't. They don't want to be proven wrong. I believe they are lying. I know of someone who conducted a click-bomb experiment and nothing happened. I believe it is a lie concocted by the company so you will blame other people or yourself when they steal the contents of your account and your labor.
Google just does this kind of thing right before their quarterly fiscal reports come out. This is how they make their "profits."
Search "adsense scam" here at hubpages or in a search engine and you will see the character of this company - whose real name is Doubleclick, Inc., headquartered in NYC, by the way. If you want to complain, try locating them!