Fraud and criminal threat

Hllo sir, my name is pankaj and i was a science student. But i fail in math, then i thought to take admission in b.com. As i belong from a science stream, previously i don't know about the critaria of b.com honours and b.com general. I have asked one of my frnd he was in college. To take admission in college by union. The boy from union said me yes you will get admission in b.com general. Then i have said ok he gave me challan of bank of admission my name was appeared on the website of college i have got fees book, but in whole of this process my sirname was wrong. After 2 month the college has said that my admission was canceled. I have asked the reason they said me you are fail in maths calcutta university has rejected you. My question was that if i was not able for that how the college has taken my admission, on startup they will reject me then i may take admission in BA. The boy has cheated me and for some of money he distroyed my 1 year. He has done fraud to me, i asked him to give my money back. He said me i will not give you. Whatever you fell do it. And he also gave my no. To his friends and they call me and given criminal threat dhamki to me that if i will go to police than they will target me and they will not let me study in any college of calcutta university and if i file a case then i will be in trouble because mamta banerji has taken some steps regarding admission through union then i will be in trouble. Every body knows that only 10% to 15% students get admission through councilling in college rest take by union only. ( can i file a case on him or in this whole incident i am also the culprit because i have taken admission by union) please help me out sir.