How do I counteract negative lies in a community where I know no one?

We moved to a community and the real estate broker cheated us. When I told her that I knew what she had done, she sought and continues to tell people I've complained about them and said untrue things about them. It's reached a point where people believe they horrid things they've heard about me that are completely untrue AND that I could/would never do. Because the community doesn't know me at all, they believe it. And my reputation, courtesy of the cheat r.e. broker, precedes me so I don't ever stand a chance in the community. I have no concrete evidence to go against her legally. Even people who know how devious she is, believes the things about me because they've spread to other folks who gossip.