I suggest you clean your apartment and try to make it more welcoming and loving. This could contrast against the negative messages the entity is sending you. Maybe get a vase with some flowers or hang up some photos of your friends and family. Decorating with posters and flyers of sport teams or music artists you like may also help.
The goal is to show the evil entity that you are a loving and caring person and that it should find someone else to annoy.
Hope this helps!