It is their standard bull shit reply - note how they refuse to assist anyone in tracking down who is responsible for the false clicking. So they are not interested in helping you to ban the culprits from your site. They will wait till you got just under the $100 and then ban you And keep whatever they owe you. Same thing happened to me 4 years ago with some sites I had that were NEVER advertised - they relied solely on traffic sent by the SE's Google was the one sending us the most visitors so they were responsible for sending the fraudsters but they refused to help stop them.