Where can I escalate a complaint against an HR officer in an academic institution

Problem/Goal: If I need to report an HR officer for a potential violation of an institution’s Code of Conduct, where can I escalate the concern when HR itself is involved? What is the proper process to ensure the matter is reviewed appropriately?

Context: I am an external party (not an employee or student) seeking guidance on proper escalation procedures in academe. I have information suggesting a potential violation of an academic institution’s Code of Conduct involving an HR officer, specifically relating to a prohibited or undisclosed personal relationship.

Because the concern involves HR personnel, I’m unsure which office or oversight body would be appropriate to ensure an impartial review. I am looking to understand the correct reporting channels and documentation typically required, while respecting due process and confidentiality.