MFC doesn't let models close/reopen accounts anymore. For the time being, you'll have to just keep renewing the 60-day bans on the prick, and putting him on ignore. Even though he's banned, you'll need to block him from posting on your profile wall too (go to your Profile Settings)...otherwise he'll be banned but still able to post on your profile wall. But then again, if you have your profile wall disabled or set to 'only friends can post', you won't have to worry about that.
If you have any screenshots of conversations where he's harassing you, send those to MFC Admin too.