Can a promissory estoppel claim be established on the Plaintiff's testimony alone?

I just received a magistrate's decision findin in favor of the Plaintiff in a promissory estoppel case. After reading the decision, I note that the magistrate cites the Plaintiff's testimony that a promise was made. He does cite a letter from me (defendant) that clearly states that we did not have an agreement and I testified to this as well. I am working with an attorney, but looking for the input of others. I thought that the statute of frauds would preclude this. It looks like the magistrate just decided to believe the Plaintiff