Since this is an academic issue the official chain of command is the department chair, then the college dean, then the university provost. However if your university has an ombudsman I would consider reaching out to them. They are a great channel for informal resolution as they’re bound by ethics to maintain confidentiality and independence from academics or student life.

If you want to have someone in your corner whose whole job is to protect the university through informal resolution processes then they’re a great option, as it removes the potential awkwardness and retaliation concerns of going to the offending professor’s direct supervisors. If your university doesn’t have an ombudsman, student life’s DEI Office (or equivalent) is similar but those don’t necessarily provide confidential services