Accounts department has no idea what they are doing!

My son was registered as a distance learner. The first semester was fine, although going to write his exams was hair raising. It is in a terrible area, with druggies & hoodlums all around. The 2nd semester was a shambles. Long story short, he registered, we paid in full, he didn't complete the course or write the exams. Yesterday, 2 years down the line, I get a message saying we owe R1500 as, according to them, he was registered as a full time student. After much heated discussion, I asked the person to send me the signed form showing that he was registered as full time... Oh, he doesn't have that information, and will have to get hold of another department to get it, in the meantime I must pay the outstanding amount! I think not! Would not recommend anyone enroll with them.