I'd probably go a step further and accuse the player of being infraction of the ToS.

3.2 Disruption. You may not in any way disrupt or interfere with the Game experience of other players, including the disruption of Square Enix's computers and servers.
Offending player has put you at the lowest rank, which prevents you from entering the house. As you're unable to enter the house, you can't demolish your room, which means you can't leave your FC and join a new one with friends. They're harassing you AND disrupting your gaming experience.

Naturally, this issue needs to be fixed 4 years ago.