Write a google review on that location about this entire interaction and experience and how it has made you never want to return there. Use an alternate google account from your normal one if you want anonymity. Don't be super anger or accusatory of the establishment. Just state the facts of the situation and how it made you as a customer (and young woman) feel unsafe amd taken advantage of. State that you feel that the store is encouraging their behavior by allowing them to remain there and come in with their targets