PAID UP LETTER FROM THREE YEARS AGO

I am really fed up with the service I have received from the collections department at standard bank. Years ago I had a standard bank Blue Bean credit card. It was handed over when I hit a rough patch. I made arrangements to pay the debt collectors ( I can't remember who they are now, but have the records at home somewhere). <br> About a year later Standard Bank then informed me the Money was never paid over to them so I then PAID STANDARD BANK AGAIN. Now three years later I still cannot get a paid up letter from them. My balance is Zero and I have Logged the call every day since last week and every day the tell the call hasn't been logged I even received a sms with reference number:***. which they said doesn't exist. I have been placed on hold for half an hour just today with no help. my ICT status still shows this as outstanding and it is affecting my credit status. I don't know what to do any more to get STANDARD BANK to sort this out.