Standard Bank refuses to close my bank account, still incurring bank charges

I had a student achiever account that was opened in Gateway, which was becoming more costly in my 20's so I moved my debits and closed the account in 2017 - I walked into the Rosebank branch and signed documents, and provided a copy of my ID. At this time, I worked across the street - Baker Street in Rosebank, JHB.

It is now 2020 and I found out that the account was still active. I logged in to my Standard Bank online banking (with my student email - ***) and saw that I owed over 3K in bank charges. I subsequently reported this via email, social media and at the branch in Constantia. I received a call from Standard bank, who informed me that they were investigating the matter. It is now 22 July 2020, the account is not closed, not frozen and I am still incurring bank charges. I am frustrated beyond measure. I did not have outstanding credit, etc. no money owing - this is all bank charges to an account that was not closed.