You did a lot more then you really HAD to do, but that is good. Contacting the ISP's would have been a lot of work, and I respect the fact that you went through the trouble to do that.
Unfortunately most huge ISP's just don't give a rats ass anymore, nor do they have the man power to deal with your issue the way they should be.
I think everything you did is above and beyond what most would have done, and others should follow your lead.
Due to this incident, if you have lost, or had to pay for help and the total is $5000.00 US or more, and you are a legitimate business in the US. The FBI will help you, and track down this jackass. They too are so swamped that they can not deal with issues unless they have caused a loss to a business of $5000.00 or more.
We had an issue like this happen to us several years ago, and wete able to get the FBI involved in it. This was before they had the 5K policy in place. We had a guy signup and start spamming from our network, and he was terminated immediately. Within a few hours he was sending out emails spamming our service saying we will be happy to host CP, and all kinds of illegal shit. On top of that, he used our return address in all his mailings. So we received over 160,000 emails.. bounces, people bitching at us, telling us we are sick fuckers.. etc. It was bad news to say the least. I honestly think if I would have caught the guy I would have taken a hammer to each individual finger.. in other words, he would never typed again, let alone use his hands again.
In the end it was some guy from Romania. The FBI tracked him down, but Romania isn't real willing to help the US with these types of things, and said they would "take care of the person". I don't know what ever happened to the guy, but the spamming stopped, and that is what our goal was.
Good luck in your hunt for the guy. I hope he gets what he has coming.
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