Unsatisfactory customers service

I HAVE BEEN WITH STANDARD BANK FOR 8 YEAR AND DECREASE TO CLOSE MY CREDIT CARD. I PHONE THE CONTACT CENTRE OF STANDARD BANK AND THEY GIVE ME THE Settlement AMOUNT. On the 26 July I paid in the amount they gave me telephonically as I could not do it eft . On the 27 July when I phone to close the account they told me I must paid in another R147. It means I must paid in nearly R250 more than I owned on my card. The customer care guy that assist me also come with an attitude to tell me I must paid it first before They will assist me.Standard bank is the worst customers centre in treating their Customers and I will tell this story for everyone how they are taking money from their customers