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Hello and welcome! My name is ***** ***** I am a licensed attorney who will try my very best to help with your situation or get you to someone who can. There may be a slight delay in my responses as I research statutes or ordinances and type out an answer or reply, but rest assured, I am working on your question.
Did you give the management company the authority to negotiate on your behalf regarding the lease?
Did you sign the lease or did the management company?
Ok, unfortunately, if you gave the manager authority to enter into a lease agreement on your behalf, the he would be considered your agent and his actions bind you. You could sue the agent for breach of contract if you specifically told him that you only wanted a 6 month and he agreed to a 12, but the lease with the tenant is still legally binding. This is under the legal doctrine called "respondeat superior" which states that the principle is liable for the actions of his agent.
I am very sorry that I don’t have better news, but please understand that I do have an ethical and professional obligation to provide customers with legally correct answers based on my knowledge and experience, even when I know the answer doesn’t make the customer happy...