Creepy man

The creepy man came in today. He was really freaking me out. I ignore him. If he needed help with something that was the only time I spoke to him. Since he was freaking me out I left and came back in 2 hrs. There's another creepy man. He gives me the chills. He always the last one on purpose. I'm afraid he will do something. I left a knife in my handbag and mace. What else could I do? I can't call the cops cause he hasn't done anything?