I CANT CLOSE MY ACCOUNT OR GET A PAID UP LETTER

On the 23rd ,I called Telkom for a closing balance of my accounts so that i can pay and close them off. They gave me and I settled my accounts, while I was still waiting for a paid up letter(which i was told I was going to get in 7 working days), I got an invoice for August which was supposed to be debited from my bank,but it wasn't. I asked the consultant for the amount remaining including charges(because according to them I missed August payment, therefore they are charging interests but why didnt they debit the money), I went and made another payment again with those interests charged to avoid it affecting my credit records. I asked why didn't they debit their account, they said the account is closed..I just want them to send me a paid up letter ASAP I have waiting so long now since the 24th of August until now ,when I call its different stories, please help. They can't even transfer me to supervisors or managers regard to the issues im having.