I'm sorry to hear that. What you should do is Report the messages as Inappropriate. (Not spam.) You'll have to sit down at your desktop to do it or somewhere where you can access My Messages on a web browser as opposed to an app on a mobile device. It's at the bottom of the page. It takes a few minus but be sure to report each message as profane. Also, if you're a seller at any point, you'll want to add this person's ebay ID to your blocked bidders list. Good luck.