I am so sorry for your horrible experience. It is a shame that there are people out there like that who will take advantage of people. Unfortunately, it is a civil situation and there isn't really anything the police can do to help.
Do you have a local TV network with a consumer advocate? Our local networks have them and they will help people with problems like this for no cost. They usually get good results because they publish the stories.
I hope you get this resolved quickly.