After being stalked myself, for years, across borders, I can tell you the police doesn't care unless you can prove real, imminent danger. I have no idea how to prove that short of a written confession. A message from the stalker with a picture of them holding a knife at the door of my building, and the text I came to "visit" you but you had guests/witnesses for example didn't reach the bar of imminent danger.

The police is made of people who want to do the job but are swamped with bigger problems, and people who don't want to do any real job.