Board Thread:Support Requests - Community Management/@comment-3328485-20130127083654/@comment-168424-20130129004116

What you can do is send a message to Special:Contact/content-issue about the wiki you believe stole your content or Special:Contact/user-conflict to report an issue about a specific user.

Other than that, we forum participants, as other users, can't do much to help you except maybe give you advice on how to reconcile with this other user.