There seems to be a statute of limitations for everything else. What is the statute of limitations for an oral contract with an attorney for a one time service?
Generally speaking, the statute of limitations for an oral contract is six years from when the action accrued. See, R.C. 2305.07.
You may want to consult an attorney about this, however, because your former attorney likely is asserting other causes of action. Also, attorneys are expected to put fee agreements in writing for the protection of the client (and the attorney.)