You don't need to be a dick to people who are trying to help.
It could be coincidence, but yes, it's quite plausible that a competitor is attacking you. You can either continue to complain about it or take action. Either start blocking IP ranges to make it more difficult for them to click ads, or invest your advertising money elsewhere.
Complaining will get you nowhere though. As you should already know, Google's customer service is non-existent. Only when enough people abandon AdWords will Google take interest in their customers again, and only then.