Fees

My son is doing his 1st year articulation for his degree in Batchelor of IT at Richfield Graduate inst of tech, at the time when we registered we were told that the cost would be R21990.00. I have made several payments leaving a balance of R6990.00. I just received a message advising that the balance on the students account is R12716.00 . I have engaged Zamakhanya Gcwabaza several times to understand the discrepancy and not getting any feedback. All outstanding fees from last year was paid up as I paid the total amount at the beginning of the year.