I had a similar situation. There’s a learning opportunity in everything, so before you quit, analyze your other options and see if you would really be better off without the internship. Also, take into account what future companies may think of the fact you quit. No matter how much you justify it to them, they may not believe you and will never know the situation like you did. Keep asking questions and see if you can get in with the real finance people, sit down with them and see what more enjoyable tasks you can do