The internet is not as anonymous as people think. To avoid the more obvious aspects of traceability, takes a skill and knowledge level well beyond the capability of the mentality required to "spam" a game site.
Perhaps a fellowship which fencer passed the offending IP's with date and time of attack might be an idea?
One thing, we have a worldwide membership so finding a local agent should not be to difficult.
Alternatively given the size of the concerned membership, electronic warfare is not beyond our capabilities.