The Night Caller (1998 film)

The Night Caller is a 1998 thriller film starring Shanna Reed and Tracy Nelson about a crazed woman who becomes obsessed with a radio talkshow personality.

It doesnt take long for Beth to quit her job, threatening her nasty boss with a knife while shes doing so. She despises her bedridden mother because she made her work long hours to support her and chastised her when she quit. After the chainsmoking, emphysemic mother dies as a result of being deprived of oxygen, Beth finds out that she had more than 80,000 worth of a stock in her portfolio, and becomes even more enraged that she was forced to work for her even though she had plenty of money.Beth becomes even more obsessed with the talkshow host and, after unsuccessfully trying to reach Lindsey again at the station, she tries to reach her at her psychiatry office. She then learns that Lindsey has an answering service and that its workers get to talk to the host all the time. ........

Source: Wikipedia