Useless and lazy Standard bank cost dream job!

Since early 2017 I struggles to sort out an account with standard bank. After struggling to get hold of them and trying to find out how the account came about and why they had added so much fees and interest, I finally gave a just paid the account. The last payment was made in October 2017. It is now 8 months later and I find that they still not updated ITC still have a negative mark on my credit record. I have been declined for vehicle finance for this account and this account alone. Now I because of this I can not the vehicle I needed for a new and promising career. Who can I take this further with and finally it sorted out??