Pathetic service

On 30th of May I asked to settle and cancell my credit crad. Numerous timeI asked do I need a settlement and if so do I pay using my credit card number as the account number or can I transfer. Since the till today the 9th June I have been struhling with this issue. I spoke to 10 different agents since the. One agent told me that I can only transfer the outstanding balance which I did. Now when I want to cancell the credit card now nedbank says there is an oustanding ammount and all of that. I HAVE SCREENSHOTS being told I can just transfer. Now I am at such a frustrated point. And I feel that the person who told me to transfer can pay that oustanding money. I want this card cancelled.