I get similar questions a lot. My best advice is that you should strengthen your own means of magical self defense. I don’t know your skill level, so please forgive me if this is too obvious.
Learn a banishing ritual and practice it daily. At least until you feel the presence is gone.
Learn goetia. Seriously, learn to deal with these entities on your terms. You may find out they aren’t all that scary.
Even if you don’t feel all that powerful, don’t let them know that. Speak from a place of authority. If you really suspect a malevolent spirit is influencing you, find out what you can about it and then tell it to fuck off.
Anyone who tells you that they can banish a spirit remotely is lying to you. If you feel like you need a professional exorcist, find someone local. Not the person who told you about it in the first place.