None of them can do anything to you if you don't let them. They don't have any power to influence your placement or internships or anything else, they just want you to think that they do. If you are too afraid to report this to the university authorities or anti-ragging squad, just drop a mail to the UGC at helpline@antiragging.in or call them at 1800-180-5522. These scums won't know what hit them. More power to you, they don't own this institution.