Miller-Motte Technical College Scam and not accredited. Wilmington North Carolina

I attended Miller-Motte Technical College from March 2013-Novembe 2013 when winter break was long in effect.  I found the classes to be so easy, and I pulled straight "A's" the entire length of time. I ran into problems with my accounting class and I needed help but couldn't find anyone to help me.  No tutors were available.  I ended up becoming ill and had to be withdrawn from school.  I had no outstanding loans through them at the time.  I am feeling better now but now they Miller-Motte is calling me and harassing me saying I owe $4000 in money to them.  They want my checking account number so they can deduct so much each month.  I am enrolled at a accredited college now and am actually getting grades that reflect my learning.  I am frustrated because I am not working and have no way to pay this money back at the moment.  I know they are going to continue to harrass me.  Has anyone else had problems after leaving Miller-motte?  I need to know what to do from here?  I really am in no position to pay this money back while i am still a student of another university. Thank you!