There was a spammer on the VAF page - when I clicked the option to remove the post there was another option to report the post and block the person. They were then removed from the list and I believe unable to access the page again.
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Yes, you can either just remove the fan or you can remove them and block them just like Tess said. Once they've been blocked, they won't even be able to find the page in a search (from their account).