I also have used the freezer banishing spells. They seem to work well to block a person from harming you. If this person is really up to hurt you or is constantly there, you can reinforce the spell by using your urine instead of water ( I know it sounds disgusting but it works LOL ). But the most important here is your intent. It is not just dropping the piece of paper in the liquid and putting to freezer, you need to specify why you want to freeze this person and state that from that moment on, he or she cannot harm you. Remember it is not the specific steps, but the intent and energy you put that will make any spell work.
Hope it helps !!
“Bright lights flicker in the dark evenings of summer. Pinpoints of hope float against the black descent of night. The sweetest of small and innocent creatures finds its way through the shadows.”