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I was told once by OV that they would "block" an IP, but I later found out that they did not do it. I don't know if they can actually do that, but I doubt they would block a group of IPs...it would potentially cut into their revenues.
Make sure you were charged by OV for the clicks (count in your logs vs count of clicks charged), and give them specifics about time/day/IP. You may have to insist on a refund...they will first say their software will filter out fraudulent clicks. Sometimes it will...sometimes it won't.
added: Even if you block their IP, you will still get charged. However, you could redirect that IP to a page that says: "STOP CLICKING ON MY ADS!" That should scare them. :)