Nonvoluntary participation in survey

I am a student in a course where the instructor required us to fill out a survey that is part of their personal research and not related to the course material. I did not participate in the survey, and as a result, points were deducted from my homework grade.

I believe this is unethical and potentially coercive, as participation in research should be voluntary and not tied to academic performance.

Where to file a report?