Individual litigants may conduct the trial of their own causes in the municipal court of any city affected by the provisions of this act, but it shall be unlawful for any one excepting an attorney at law to conduct the trial of other than their own individual suits in any such court. Any person violating the provisions of this section shall be guilty of contempt of court and may be punished therefor by any judge of the municipal court or any circuit judge of the county in which such city is located, by a fine of not more than $50.00 or by imprisonment in the county jail of such county for a period of not more than 30 days or by both such fine and imprisonment in the discretion of the court.