I am so sorry you're dealing with this. Could you get a restraining order? Or just come up with a plan to call the cops if they come around and you don't want them there? You shouldn't have to live in fear like this. They do not deserve that kind of power over your life especially after what they've already done. Do you have any friends who could intervene and support you?

Also, would getting some pepper spray or a Taser help you feel better prepared? They're non lethal but they are effective at convincing people you don't want them there!

Oh, and you could also change your phone number! Most cell companies will let you do that.