He's Asking For Me (1990)

After a sheltered upbringing in St. Helena, Norah arrives in England and goes to live in London, taken under the wing of her Uncle and his business associate Andy. She works for the latter and falls in love with him, but he refuses to reciprocate her feelings. When she starts receiving a series of obscene phone calls and letters at home and work, she is determined to identify the caller, and strongly suspects Andy