I setup a system to track every google adwords click by ip address then created a spreadsheet of the reverse dns and how many clicks to try and get a refund. It didn't matter how many times one ip address clicks through Google says that sometimes it might take a lot of clicks from one person because they are "deciding" if to buy or not. Anyway I sent several of these spreadsheets to Google and received a refund for a measly $28.00. They say they automatically do refunds but I get about $10 per $10k in refunds back automatically. It is not a very large amount.