How to give feedback on a course when no evaluation was offered?
Typically, the dean of each department is the person who has the ability and the know-how of each professor to actually effect some change. That changes by school and by department, but you can't go wrong by finding your dean's office and dropping in or sending an email. I've done it before and action was taken very quickly, but I happened to be a part of a very well-structured department with passionate staff.