I have seen several posts in other forums, that will remain nameless, with people saying that they have simply written Google when they got the notice that their account was being investigated, or something similar. They said all they had to do was write Google and things got straightened out, but the tone of the posts sounds as if it is just standard procedure for Google to question your clicks, and to then wait for you to ask them to look closer. so that you can get your the money from them.