Snegithiye
Jyothika, her best friend Sharbani and their friends are pranksters in a ladies' college. Lakshmi, Sharbani's aunt wants her niece to get married. To escape, Jyothika and Sharbani fake a boyfriend whose name is Ramesh. However, this fantasy takes on a whole new meaning when a person named Ramesh calls and sends Sharbani letters claiming to be her boyfriend.
Starring Jyothika, Tabu, Sharbani Mukherji, Lakshmi, Ishita Arun, Manorama, Shweta Menon, Major Ravi, Mita Vasisht, Sukumari
Watch "Snegithiye" on Amazon Prime released in 2000. It's a mystery and thriller movie, and has a rating of 6.7 out of 10 from Imdb which is usually fine for this kind of movie.