Plantiff lied underoath, and magistrate caught her, but did nothing, why?

I was the defendant in a tennant case, my roommates sued me for unpaid rent..when they had bullied me out of the apartment and attempted to change the locks, my lawyer told me to stop paying rent, because he didnt believe they would do anything about it. Turns out one of their cousins is a lawyer and they are very competative girls. Well one of them was asked a question one way by the magistrate, then later that same question in a different form, and the plaintiff clearly lied to get her way and make her case look better. Why didnt the magistrate do anything about it?