My sister was being stalked years ago. I gave her 2 pieces of advice.
1) when you get the stalker on the phone, preach the gospel to him. This was in the days before cell phones and immediate knowing who it is on the other end of the line.
2) buy a gun. It’s a fast, cheap way to feel more secure.
That advice about preaching the gospel to stalkers has worked several times with different women.
That’s a good one about preaching.
BTW....using a whistle and blow their eardrums off also works.