I paid my fees this month for first semester in full and held a balance of R 8000 in my account as credited on my account hence l registered for new module for second semester

I paid my fees this month for first semester in full and held a balance of R 8000 in my account as credited on my account hence l registered for new module for second semester. A few days later my results are blocked l want to know why is that as l paid my first semester in full. Besides it's not even 30 days since l registered a new module So on what basis am l classified as a debtors. When l try to query the issue you consult are not willing to help me