Once you've decided to take your grievance about an attorney to the State Bar, you need to file an attorney complaint form. Find out how to resolve a problem without going to court, file a complaint against a lawyer, and how to get money back from an unethical attorney below.Instructions for Filing a Complaint Against a California Attorney. Fill out all spaces on the California Attorney Complaint Form completely. You should call the California State Bar Complaint Hot Line at 1-800-843-9053 and ask. This packet is designed so that you may be able to represent yourself and complete your divorce without an attorney. This is one time that you may noy actually need a lawyer. The complaint form is a very simple form. Visit the link to select the complaint form in the preferred language. Use Form RP524, Complaint on Real Property Assessment to grieve your assessment.