If you're reporting a live cross-wiki spammer or vandal in action and need immediate assistance through Discord: You can report through the #spam-vandal-report-fandom channel on the official Fandom/Gamepedia Discord server.
You can also join #wikia-vstf on freenode (please click here if you do not have an IRC client installed) to contact a SOAP member directly. You'll find SOAP members voiced (+) in the channel and you can feel free to ping one of them for help. Only registered accounts/nicknames can access our channels.
Note that if the vandalism is localized on an active wiki, check to see if a local admin is available first before pinging a SOAP member.