Indian Railways — Unwanted people in my compartment

Address:

Patna, Bihar

Sir,
I m traveling from howrah to New Delhi, my pnr no is [protected], at Patna station, 3 people one of them was from Bihar police, were found sitting on my seat,
I requested them to vacant my seat but they denied. At the same time no tte was found, sir or maam this is condition of ac compartments. I even can't explain about sleeper class. My seat no is 55 in compartment b1 train no is 13007 and name is u a toofan