BAD SERVICE

I paid my account with Nedbank Credit Card on the 5th of June and to date they say they have not received the funds and it has not been allocated. I have been following with them to check and they never answer their calls and take their own sweet time. I want to close my card and this payment was a final settlement. a simple task has now taken a week. This is so really frustrating. I have to send an email and wait patiently for someone to call me. CAN SOMEONE AT THAT DEPARTMENT ALLOCATE MY FUNDS AND CLOSE MY CARD PLS.