I've sent them the headers and traceroute results and their abuse team is investigating, it would be more powerful if a bunch of people complained about it, so if you have a minute and are sick of the garbage from suisse bank and information desk, send a quick email to the ISP. They should be shut down.
Last resort
If this doesn't work, I have a few buddies that would love to try out their DOS attack skills, but I'd rather deal with it legally.
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