Complaint against Student achiever account from Standard Bank.

In 2014 when I was doing my first year at UWC, I opened a student account with standard bank through a mobile consultant. I have never deposited money into this account meaning it was never active. Last year which 2022, when I wanted to open account with this bank I was told that I owe the bank an amount of R7000.00 which is due to bank charges since 2014. I spoke with Mr Sean Kemp who is the bank manager of the brackenfell Standard Bank branch. Since the account was never active, He assured me that the amount reflecting on the old account is a mistake from the bank and that they will clear it up and close the account. Now it has been 6 months and Mr Sean is not responding to my emails concerning this matter. The amount has gone up to R9000.00 and I do have a job that will help me pay the bank.

Can I kindly get an advise to what can be done to fix this.