Horrible service and no proper systems

For almost 2 weeks now, I've been trying to cancel my credit card. Earlier this week the balance was around R800. Via the app chat, I was advised to email ***, which I did but have not received any response. 3 days later the settlement is R920.75 and I still haven't received the settlement letter. I have paid this amount but no one can give me an email address to send the POP, one of their consultants advised me to check again when the funds reflect. What systems does Nedbank have where I have to repeatedly send them the same request.

This is so annoying