SCARY SURPRISE FOR CLOSED ACCOUNT

I would never have thought that a bank as big and well known in South Africa would try and rob people. I used to have a Standard Bank Student achiever account. I started working as a waiter and the bank fees became a bit much. I opted to move to ABSA bank as their rates were a lot cheaper. At the end of the month I went to Standard bank to close my account and they informed me that on the day I had my last uncleared transaction. The lady who helped me said that she would close the account on her system and that in three days the account would be closed officially. Despite the account being closed I continued to receive marketing communication. It was at the end of 2020 when I received an sms to update my personal details, I found this very odd at the time and being on holiday ignored it. This week I was cleaned out my wallet to find my old standard bank card. So I decided to check if the account was closed as they had recently asked for personal details. TO MY SURPRISE I FOUND OUT THAT THE ACCOUNT HAD NOT BEEN CLOSED AND HAS BEEN ACCRUING CHARGES AND NOW ITS IN AN AMOUNT OF NEGATIVE 4000 ODD RANDS. PLEASE CAN YOU ASSIST ME IN SORTING THIS OUT AS I AM NOT GOING TO PAY FOR AN ACCOUNT WHICH I REQUESTED TO BE CLOSED AND HAVE NOT USED SINCE 2017. THIS IS ****************!!!! SORT IT OUT NOW!!!! My ID number is ***.