See: the Legal Help chapter: Legal Profession - Complaints against lawyers.
Complaints about Judges, Magistrates, and other judicial officers can be made to the Judicial Conduct Commissioner.
The Commissioner is independent from both Government and the Judiciary and is appointed under the Judicial Conduct Commissioner Act 2015 (SA) [s 7].
Complaints must be about the conduct of a judicial officer, and not merely about being unhappy with a decision that they made [Judicial Conduct Commissioner Act 2015 (SA) s 12(1)].
The conduct of a judicial officer that may be the subject of a complaint can include, but is not limited to [s 4(2)]:
A judicial officer commits an act of victimisation if they cause detriment to another person on the grounds that the person (or a third party) has made, or intends to make, a complaint to the Commissioner [s 4(3)]. A judicial officer also commits an act of victimisation if they cause detriment to a person on the grounds that the person (or a third party) has provided or intends to provide information or assistance to the Commissioner for the purpose of assisting the Commissioner in conducting a review against a judicial officer [s 4(3)].
Complaints must be in writing and must contain details about who is complained about, who is the person complaining and the matter that the complaint relates to [s 12(5)].