What is the best way to file a complaint about a doctor?

Did this podiatrist cause you any harm or did his treatment just not work? Most insoles are made just for you and she likely tried to treat you conservatively. I would let your podiatrist know they did not work as she may be able to adjust them. The State Medical Board would likely take a complaint from you but once again it is not like the doctor did anything wrong warranting formal action or even an investigation by the medical board.

let the hospital management know your complant or the professional body to which the doctor is registered,but first let the doctor know your complaint and try to resolve this only go forward if unsuccessful.