What is my recourse regarding the recission of a promise to allow an early termination of my lease?

Question Details: I have rented the same townhouse for 2 years; I just signed a renewal lease for the 3rd year. I received a letter from my rental property manager stating that if I was planning on purchasing a home during my tenure, I was free to break my lease penalty free as long as I was working with one of their realtors. I went home shopping and found a house, made an offer and had the offer accepted, all while using one of their real estate agents. I notified my rental property manager that I was planning to vacate and gave them 41 days notice because I went into contract with house purchase. Now the rental property manager is threatening me saying that I will lose my deposit and that I have to pay 2 months worth of rent as a penalty fee. I told them about the letter I received from them that I would be penalty free if I used one of their realtors to purchase a home. They are rescinding their offer because they say that letter was mailed to me by mistake and they never intended to honor such an offer. What can I do so as not lose my $1600 deposit, plus 2 months rent?

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