Despicable service

I am extremely disappointed with the service I received from Standard Bank. I called them 3 weeks ago to provide a paid up letter for my credit card. I've been calling them over and over again only to be told the request is sent through and I should receive it within 48 hours. Firstly, they couldn't even inform me of another credit card linked to my name when I queried my first credit card. I've changed my email address and informed the agent's multiple times but they still manage to send it to my old email account which I have no access to. Furthermore, I've requested a call back from a manager twice with no avail. This is pathetic service and these agents shouldn't be working in customer service.