My little brothers ex girlfriend kept texting and she had her new b/f call and say he was the police and my brother was a suspect for murdering her. I saved that message. Cops came and listened to the message. Well they called her and talked to her first. She was alive BTW. Then her new b/f. We...
Did they email you? You can press charges. Cops can find contact info just by email and I.P. I had occasional problems with jerks like that.
ETA: save there phone number and dont delete it. Call the cops and they will call them and say that if they call you again that they can arrest them