I think you should call the victim's advocate for your area and get help from them as soon as possible. I also think you should call your D.A. or states attorney with your concern. Lastly I think you need to speak with the police chief from where these clowns came from. While it's fresh have all of the witnesses write a facts only statement. Make sure to give these to police. Get medical proof that you were attacked now before bruises fade. Make a written report to the D.A. or State's attorney about the attack and what was done and include the witness statements. Including that you were the designated driver for the night. Good luck. In my opinion by taking these steps you stop being the victim and take control back. The police are not the last answer and you deserve to know what is happening with this case.