University of Phoenix Saying I still owe them money and will NOT turn lose of my transcripts. I should not pay for credits already received at another university! Tempe Arizona

I was a student at the University of Phoenix in the year of 2009. I had to drop out which wasn't a choice of my own, I just recently managed to get my student loans out of default and am now back in schoo. I now attend Ashford University and they have made several attemts to retreive my transcripts which they will not turn over. I paid them over $800.00 that they claimed I owed yet they still want more. I wouldn't recommend this University to anyone, I am out 18 credits, yes I understand that's not many, but it is when you must pay for those credits all over again. What can be done?