Standard Bank Nightmares

I closed my standard bank account 4 years ago. To my detriment I find out recently that the closure was not completed successfully and fees and interest have been accumulating over this period, I visit Standard Bank to log the escalation and they reject it and advise it is my fault, I have never been called to notify me on this account, never been asked for FICA which is a requirement to keep an account active and it is a student account which should only be allowed to be open till I am 24. I have tried via the call centre and after speaking to a consultant the call is cut with no return call, please help