I'm not sure specifically what the 'jamtara original story' is. It could be about a particular place named Jamtara, perhaps its history, culture, or some local legends.
Online local history archives or websites dedicated to the region of Jamtara could be a good place to search. Also, reaching out to local historians or storytellers in Jamtara might lead you to the 'jamtara original story'.
Jamtara is indeed based on true stories. It brings to light the realities of cybercrime that have occurred and presents them in a fictionalized format. Though it might add some fictional aspects for better storytelling, the core is drawn from real-life events.