Thread:Callofduty4/@comment-26011081-20150725002921/@comment-1142365-20150725003503

You have every right to block them out of your wiki indefinitely.

You might want to contact Wikia about the second question since I am not sure if that is covered by the ToU. If you ask me, it's not really a big deal (best to just block and ignore them instead of visiting their chat).