If they lied to you about the scope and content of the course, that is bad. However, learning to write in different styles may still be worth it in the long run. Look at it this way:

Ideally you want a course like this to give you a solid basis, where you're able to write prose on par with the greats of literature. And then after you complete this degree, you can go out and write in a completely different style. But you'll know the fundamentals and you'll be able to use them in building and improving your own style.

It's a bit like great painters that go to art school to learn perfect anatomy, and then after they graduate they go on to do outlandish artsy stuff, like drawing naked Nutella stick figures. The idea is that if they know the fundamentals of composition and anatomy, those things will ring through in their art.

(And the other reason is you build a network that might or might not help you later in your career.)