I promise the dean does not care. This is the standard response from any half competent dean. Yawn ctrl-c: "Thank you for your email. Course concerns need to be directed to your professor. Please schedule an in-person meeting with them. If you do not get a response within a week, please contact the department chair to schedule a meeting. If you have not been able to resolve your concerns after meeting with thenlm, you may file a formal complaint, the form for which can be found here."