Call Girl is a 1974 Bollywood romantic drama film directed by Vijay Kapoor.
When he attempts to introduce her to his parents, on reaching his house his mother accepts her, but there she sees his father's (Sonachand's) photo and she recalls that he is the same person who had forced her into prostitution by promising her a job.
So he tells Kamini to act like a call girl once again so that Amar leaves her.
His father shoots himself because of his guilt and Amar leaves his house to go to find Kamini, and sees that she has consumed slow poison and is about to die within a few hours.
So Amar quickly uses her services as a call girl and pays her for a one-night stand before she dies.