Standard Bank GARAGE card division VERY BAD service

During March 2018 I was at the Centurion Branch Standard Bank and requested to close my Garage card. I was helped by the staff to phone to the card division from a Standard Bank phone line, and spoke with the card division man and canceled my Garage card. Today, 12 June 2018, Standard Bank phones me and tell me that there is an amount of R166 outstanding, which is the accumulation of their fees since I closed the account. This is very unfair to me, as I was helped inside Standard Bank, and this is how they treat their customers.