What we have here is a Title IX issue, and there are specific school administrators who deal with this. In fact, as soon as the OP would go and make a complaint, the school is required by law to look into it. I'm hazy on the details of what events would get triggered, but my notion is that with the presentation of evidence of a crime, the school would not just shut this up, but would involve the law. I'm going to have to ask a specific dean at my school just what the procedures would be.
Again, OP, there is a lot of sage counsel in this thread advising that you go to the police. Please do that.
The Only Thing Necessary for the Triumph of Evil is that Good Men Do Nothing
attributed to Edmund Burke