PAGANS...those who practise witchcraft?

do you know of any specific banishing spell to stop my boyfriends ex partner from causing trouble with us. ?? she already has taken all his ests, and wont sign them back to him, and has used violence against him on occasion. hes seen the police. done everything properly. but she wont allow him to move on. she calls him constantly saying she is about to kill herself. she needs to leave us alone. any ideas please ?/