Poor Customer Service!

I settled my Credit Card on the 25th of April and called Nedbank on the 27th of April and requested that my Credit Card be closed and I be issued with a Paid Up Letter. I was told that the Credit Card would be closed in 48 hours and issued with a Reference Number. Its been 7 days later and my Credit Card was not closed. Nobody reached out to me to explain why, so I called Nedbank only to discover that my request was not actioned and now I've been told it will be closed in another 72 Hours...its been more than 72 Hours since my first call on the 27th of April, why must I wait a further 72 Hours? Very very disappointing service!