Thread:Mark Otaris/@comment-4196050-20140209181708/@comment-4812386-20140210010640

Do not delete the page, just move it to the user space of the user and notify him and explain the situation. You can ban him or not as you wish, depending on what you think is best; it’s usually a good way to make them actually read the policies when you feel they're not going to read them if you don’t do it.

As for your second question, I’ll quote our verifiability policy:

Information on this wiki must be verifiable. This does not mean that every statement must be supported by a reference (although addition of references to articles is recommended); rather, it means that when a statement in an article is challenged (when someone asks for a reference or explanation of the source of a statement, either on the talk page of the article, on the talk page of the user who added it or directly inline in the article with the citation needed template), it may be removed after some time if no verification of it is provided.

This means you can remove any information that he is not able to provide proof of.