Mba college placement cell forcing me to join company which i dont want to

I am an MBA student. In campus placement activity a company offered me PPI and my "college" team asked me to accept or reject it with in approximately 8 hours. No information about salary or job profile was given at that time. When I accepted it then after 10 days I got salary structure with which I was not happy and on next day my interview was scheduled. I went for interview negotiated salary and when HR said salary cant be revised then I said I dont want accept this offer then at given salary. But still HR selected me and offered me PPO. And now my "College" team forcing to accept it whereas company HR is fine even if I rejected it. We have signed rule saying if we accept PPI and then we are offered PPO from same company then we have accept it. But in my case no information was given at the time of PPI acceptance. And there are many other things too kept hidden by "College" placement team. Its been 3 days now there asking me to accept it else they will throw me out of placement procedure. I couldnt sleep properly for past 3 nights. And its mentally harassing me. What should do?