So after over 100 tickets you suddenly chose to stop caring, but still managed to care enough to post in the forums about this and post on several other websites, hoping to catch Square Enix's attention? I'm not trying to sound mean but you're not fooling anyone. It is clear that you deeply care about this issue otherwise you wouldn't have harassed the support staff for months on end over an issue that can't even be considered harassment.
There's a reason why your over 100 tickets don't lead to anything. A person's character simply hanging around is not harassment. This is an MMORPG. If you want to be alone then close down your FC house or hide in an inn. If you don't like someone leaving messages on your FC Message book then close it down. It's not hard. There are tools in place to deal with these kinds of issues. You just aren't using them.