A very upset and a client that might exit the relationship

I called the credit card call center to close my credit card on the 26th of June, the lady adviced that i need to pay an additional R150 for the balance. I immediately transferred the amount from my Nedbank account. I asked if i need to call back to make sure that it was closed and the agent said no, i will receive sms's to confirm the insurance and other cancellations. To my surprise today i went into the app to see if the card is closed and it hasnt been closed yet. I am not willing to pay an additional amount to close it as i did my part. Whatever additional costs that are there i will not and am not willing to pay them as it was not my negligence.