Agni Sakshi 1996 on netflix

Suraj Kapoor is a single, wealthy young man. One day he meets Shubangi, and they fall in love. Shortly thereafter they marry and settle down to enjoy a harmonious married life. During their stay at a hotel, the couple are approached by a man who claims that Shubangi is his wife and her real name is Madhu. Suraj and Shubangi are shocked and ask him to leave, which he does. Then the guy rings up Suraj one night and asks him to come to his room. When Suraj comes the guy tells him that his name is Vishwanath.