I would definatley contact an attorney. There are breach of contract laws however there are also ethics involved. I would take a copy of the management contract, the lease, & any letters or emails (documentation) with you to the attorney to find out your options. Good luck.
Century 21 Broadhurst & Associates
I recommend taking a copy of your agreement and this information to a real estate attorney. Without having a copy of the rental/mamagement agreement, it is diffidult to say who is in default.
For example, why does he think you are in breach? What term does he say you violated, and was it written in the agreement that he could keep the deposit if you did breach the contract?
Real Estate Professional
Russell and Jeffcoat Real Estate