I don't think they charged the advertisers for those clicks since they thought them fraudulent.
Come on, PR may say "oh no, we give that money to charity" while texting from a yacht in the middle of the caribbean.
Interestingly, AdSense bans are almost always around pay day. We don't know what they do with the funds after an account is banned — we can only go on their word and goodwill, which we know is not to be trusted.