Most *********** bank ever

I am seriously frustrated at the horrible levels of service from the credit card division. All I require is a settlement letter, just one email with an attached. Apparently this cannot be done via the branch so I had to call in. It has been over a week since my first call and I am still waiting. Each call I am told that it will be done within 48 hours. I have to keep calling every 2 days only to be told to wait another 48 hours. For an email. How long does it take to send an email? What do I need to do to get assistance? Do I stop paying and wait for someone to call me and risk a poor credit profile just because no-one at the card division is aware of how to send an attachment via email? This is beyond ridiculous and now I want nothing more than to shut down my accounts and have nothing more to do with this pathetic excuse of a bank.