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Also what operating system is your server running on?
Contact email@example.com and let them know what happened. They will take action on that individual. I've worked with them before in a situation like this and they ended up dropping the subscriber. They will probably want to see your log files as well.
Note: You may need to reset your categoryid.txt and linksid.txt files to the proper counts. Ask around over at GT, someone there will know whether that's automatically done w/ the backup.
cheers for the advice.