Cancelled Account but FNB still issue me with CARD

I called FNB on the 3/11/2015 advising them to cancel the credit card. I was advised of the amount to pay to close the account and I paid them on the same day.I called on the Thursday of the same week to check the status of the account as advised by the consultant,but the query was not yet actioned.Following week I called again and was not given the clear indication of the status of the account.To my surprise on the 1st of December ,I received my statement and I still owe FNB.I want to know what does one have to do to cancel the credit card with FNB .Tried to call them and there is no reply and is very frustrating.