I have been promised Masters for the amount I sett...

I have been promised Masters for the amount I settled with Amercian Collection Agency and after receiving payment they informed me i have to complete 5 more courses with 800 extra dollars for each class (I signed up in 2013 when the course fee was 1100$ now I pay 1975$/ month). I hope no one ever goes through this horrible experience. Im not on their F1 Student Visa. All I wanted was my masers and I feel betrayed.