Board Thread:Support Requests - Community Management/@comment-104.238.38.157-20180913174735/@comment-168424-20180913175832

Special:Contact/general. There is a Special:Contact/user-conflict page, but it is mostly useless and just has some generic advice.

Be as detailed as possible and hopefully you have links to public statements by the user in question that can provide evidence of your account. This is why I rarely hold private convos about wiki policy unless it is really needed.