I revoked previous consent given to my attorney to represent myself and another of his clients on a contract negotiation.

It is not clear from your inquiry whether you discharged your attorney altogether or simply insisted that he not continue to represent his other client, while continuing to represent you. It is also not clear how, if at all, you were harmed by the actions taken by your attorney after you made your request. As a general matter, your rights under these circumstances will depend on the terms of the attorney's engagement and what, exactly, you told him about his future role. You will wish to consult with another attorney about this, preferably one who is capable of handling both the ethical issues and the contract ones.