Complaint Review: james madison high school

I was paid up on my tuition for james madison high school. I paid almost $900 to my high school courses through them to recieve my diploma only to be told that because they updated the curriculum I would not recieve my diploma unless I pay anoth $491...the said that they informed all of the students of this but because my account was locked at the time because I got behind on a payment, I did not recieve te notification. So, Ive not only wasted my time since 2011 but Ive also wasted $900...and still will not recieve my diploma unless I pay the extra money! Whats next? If I pay it they will come at me for more fees? Nice way to con people...