Can't close my credit account even after it should have been done 5 years ago.

So I went to the Wonderpark junction branch about 5 years ago to close my credit card account. The lady who helped me made sure I didn't owe anything on the account, had me sign a bunch of papers, cut up my credit card and sent me on my way. Fast forward to this year when I went to close my cheque account only to be told I still have a credit account and owe money on it. Was told I had to phone the credit card department. When I phoned they couldn't tell me why I owed money on it and sent me back to the branch. The guy who helped me at the branch flat out told me he couldn't believe that I didn't know about this account as there was a monthly automatic payment made by Standard Bank into my credit account. I assumed as it said SB Autopay it was bank charges. So to close my account I have to pay off the debt and then phone the credit card department to have it closed. I paid the outstanding amount but had to wait 48h even though it was paid from a Standard Bank account. The next day I receive a sms notification that my purchase for amazon prime (I don't have amazon prime) was declined due to an incorrect cvv number. When I phone the credit department to tell them someone is using my account she tells me that she will report the ***** but that there is some kind of hold on my card and someone will contact me within 24h. 24h passes but no one phones. So I phone again. Again told that there is a hold on the card so it can't be closed and even more payments have been made using my credit account. I phone the ***** department and receive a service request number. 2 Days later I get a sms notification that the issue has been resolved and that I will be contacted with the details. Another 24h later and I have received nothing! I am beyond frustrated with this pathetic service! How am I supposed to trust them if they can't even close an account? And then allow ******** to use my credit account even after I alerted them to the fact! It is absolutely ridiculous.