Okay, so it is kind of a weird situation and we don't know what to do. The situation is this:
I am currently doing a math major and some of courses have two different (but equivalent) options -- application based, or a proof based option.
I am working on a pure math degree and so I opted in for the proof based version of the course, since I think it will better prepare me for later math courses.
However, the professor assigned to teach the course this term has never taught the proof based section before and straight up said in the first lecture that he was going to teach us the application based version of the course despite our choice.
A few of us went to complain to the chair of the dept. but to no avail, he simply addressed the class and said "If you don't like my lectures, don't come." Is there anything that can be done about this situation?