You're here to do one thing: walk across the border. On the Bangladeshi side, you can walk the 2km to the bus stop or take a rickshaw for Tk 5.
On the Indian side the bus stop is near the immigration office. As you step out of the immigration office to the official moneychanger's stalls, there may be people sitting around who can arrange a taxi to Kolkata. I paid Rs 900 in Jan 2008, but usually it will be more.
