Grand Canyon University GCU is ripping me off Phoenix Arizona

I made a change to my class schedule two weeks before I started a course, and I had an email from GCU saying that my student loan would be fine for the change.  Three weeks into the class, I had a call from GCU asking how I would pay for the class change.  I told them that I had an email from an advisor saying my student loan would take care of it, however I was told that the advisor shouldn't have said that, and that I had to pay for the class 100%, and they would not take money from my FAFSA.  I immediately cancelled the course, but I was told I had to pay for the full course.  I argued my case with several at GCU, but it fell on deaf ears.  I'm now receiving calls from a collection agency to pay $927.00, and I am refusing to pay.  

GCU should cancel this tuition payment.  I will continue to fight for something that they confirmed would work out with my student loan.  Even if the advisor made a mistake, they should pay for their own mistakes in customer service.  I deserve better than this.