Unix Enterprises — to claiming about money

Address:

153 purbigharari kharik, Kharik kharik bajar, Bhagalpur, Bihar, 853202

Sir/mam
I m a btech student. I m trapped with a company whose name is unix enterprises. After two days i notice that it is a fraud. There after a man call me whose name is nisar ahmed shaikh who told me to pay the 8000 rs to the company as a fine... There after i didnt pay him then me he send a letter to my house to regarding something. So i dont know what to do please help.