What to do if lecturers provide incorrect teaching content?

I have two lecturers who regularly told us incorrect things. Either they contradicted what was taught in other modules, or tutors etc. told us that some of the information in the lectures was simply wrong. Now I'm wondering, since the university is private and not exactly cheap, what we can do about it and how we can proceed, since this definitely shouldn't be the case.

The problem is also the fault of the university, as the two lecturers are teaching modules that they have not actually studied, but are normally active in other areas.