To say that hiring a lawyer will not do you any good is incorrect. Hiring a lawyer could expedite the broker's release of your contract if he thinks you're seriously going to pursue him. And a lawyer may find that in fact, the broker did violate fiduciary responsibilities or other terms of the contract.
That said, contact the local board and file an ethics complaint. Anyone who requires membership in the local board will hate to receive a notice that they are being investigated for an ethics complaint. And throughout this process, document every single communication you have with anyone regarding this issue. Including sending emails/letters to document any verbal discussions.
Good luck to you.
What I am not certain is if the Broker you spoke with was the actual Broker/Owner of the Company or the Broker/Manager. If not the Broker/Owner, then call the office and ask to speak with the Owner to see what you can work out, if you are still listed with them.
If you have a question about a specific property, or the market, or market conditions - or Real Estate in general - talk to your agent.
If you have a question or concern regarding a legal question - consult a lawyer.
I don't know if it's a fear, or not wanting to allow anyone else inside thier little area of control, or what - but realtors seem to be dead set against a client ever talking to a lawyer, unless it involves something that they legally cannot help you with. I see it ALL THE TIME. Your realtor will sit there and say "trust me, i know what i'm doing - lawyers will just cost you more money". Then if you find yourself in a jam all of the sudden it's "i'm not allowed to give legal advice, i can't help you, talk to your attorney."
My advice would be to consult a lawyer, find out what your rights are, find out what you can or can't do based on your contract, and go from there. I would also reach out to the board of ethics regardless and file a complaint. A few people on here have thrown out some hypotheticals - but reality is they have no idea what your contract states, and even if they did - legally they really can't give you a whole heck of a lot of advice about it (since they're not allowed to practice law, and advising you what you can do legally would be giving legal advice).
Often brokers will realize that a relationship of trust must exist between a client and the agent and/or broker. If that relationship does not exist, it's very difficult to bring a deal to successful closing so there's no point in trying to continue to insist on maintaining an agreement with a client that obviously is not working.