Why would you want to stay and work there if they've already misled you, and done nothing to lead you to believe they will fix it in the future?
I wouldn't hold my breath for an offer for after graduate employment, if I were you. Most large companies (assuming by "large entertainment company you mean decently large, that is) don't hire in house counsel right out of school. They hire midlevel or higher associates who already have a good rep, and have done the work the company needs it to do. This isn't the *only* way to get in house, but its the most common, I think. If you do want a job at this place, you need to first look at how the other attorneys in the legal dept got there - did any come right from law school? If no, then you're probably not going to be the first, and I'd look elsewhere. If yes, then you need to sit down with someone in HR and/or the legal department, explain your dissatisfaction, and ask for a straight answer of whether or not your services will ever be used in a legal capacity. If they don't give you a straight answer, start looking for something else.