Rapewoman: Dirty Sunday (1981)

A single woman starts receiving obscene phone calls at home. Feeling fearful she stays at the apartment of her best friend but somehow the pervert starts calling her there too. Feeling hopeless she gives in and agrees to meet at a restaurant. But when the woman and her friend arrive they discover it is managed by the man they both had relationships with. This was why they were let go from their previous jobs. They both decide it’s time for a little payback.