1  There, the Court of Appeals held:Uniform Superior Court Rule 4.12 (253 Ga. 799, 816) provides as follows: "An attorney of record has apparent authority to enter into agreements on behalf of his client(s) in civil actions. Oral agreements, if established, are enforceable." Appellants contend that the Rule and the holding in Brumbelow are in conflict, and that since the Supreme Court enacted the Rules subsequent to its decision in Brumbelow, the Rule controls and permits enforcement of the purported agreement. We agree, however, with appellees' argument that although the Rule makes oral agreements enforceable "if established," Brumbelow decrees how they are to be established. That is, where the very existence of the agreement is disputed. it may only be established by a writing. [Id. at 829.]