It's not so simple as to just say the girls should have gone to the police. In a perfect world, there would be justice for all. But I suspect in this type of situation, police would say that it's a contract dispute and a civil matter that is not under their jurisdiction.
Even if there was a crime, many victims don't report them. I'm not saying what happened to these girls with GDP was sexual assault, but some might perceive what happened as being a sexual crime. According to mcasa.org's
Reporting Sexual Assault: Why Survivors Often Don’t,