Credit card not cancelled as requested.

In November 2015 I had to cancel my accounts wit Standard Bank as I was emigrating to the UK. I therefore cancelled my cheque account and related garage card. Comien Hoffman from the Standard Bank Secunda Branch told me to phone the credit card line to cancel my credit card, and I effectively did so. The call centre assistant assured me that the card would be stopped in approximately 12 days. PLEASE NOTE THAT ALL OUTSTANDING FEES WERE PAID UP BY THEN. In December 2015, I received a credit card statement with service charge levies. I phoned Standard Bank in December and the operator told me that the card was not closed as requested and that the card would be closed and the charges reversed. Thereafter I received verbal and sms confirmation that these funds were reversed and the account closed. In March however I received yet another statement for service charges, and was told by the Standard Bank call centre assistant that the insurance on the card was not correctly cancelled. I phoned the insurance line and the operator assured me that the funds will be reversed and that this will never happen again. Now I receive letters from Standard bank requesting the payment of outstanding funds or legal action will be taken. This is outrageous and unacceptable. I have done all I could to follow up on the negligence of Standard Bank and is now at wits end.