When a Stranger Calls Back (1993) on Netflix

Plot summary

Julia Jenz takes a babysitting job at Dr. Schifrin's home and is left alone there once the couple go out. A man at the door says his car has broken down and asks to use the phone. Julia will not let him in; she offers to phone the auto club for him instead, then discovers the line is dead and tells him the call went through. He keeps coming back for help and the exchanges turn sinister. Five years on, Julia is an introverted college student and strange things keep happening in her apartment. Jill Johnson, a counselor at the college, offers to help with the old trauma and the new disturbances, and calls in the retired detective John Clifford.