i think i'm being haunted

Come on! Michael is only an Archangel! And may I remind you that there are SEVEN classes of angels more powerful than them? Now when you're dealing with Ophanim, Cherubim, Seraphim etc. then you've got a lot to worry about, but Archangels can be reasoned with and aren't that powerful.

And by the way-- I wouldn't use a Daemon If I were you! If you lose control of it you'll just have two entities to exorcize instead of one!

True to the second post, but remember the bible is not infallible on angelic subjects. Use their system of organization and you have 6 orders that really aren't needed.