No proceeding or decision of the ombudsman may be reviewed in any court, unless it contravenes the provisions of this chapter. The ombudsman has the same immunities from civil and criminal liability as a judge of this State. The ombudsman and the ombudsman’s staff shall not testify in any court with respect to matters coming to their attention in the exercise or purported exercise of their official duties except as may be necessary to enforce the provisions of this chapter.