Extremely dumb movie, they just dragged it, no mystery in it...they found a pen drive of deceased in the start and the investigating officer thought let's wait till the end of movie to check it, it could be nothing...their constable found out the caller phone booth location but forgets to tell his team.
If any of the above would have happened when movie started, it would have ended just then and there.
No mystery, pure dumbness to drag and tag it as a show. It's like I can decide to overlook my dinner and kept guessing the world around it before looking in the kitchen where my mother had already told me it was.