VERY ANGRY CUSTOMER!!!! FNB IS A JOKE!!!

So here we go again. Your service is shocking. I sent through a form to cancel my credit card that you have blocked (without letting me know, because you hadn't received my document - which was bull i had sent it through 3 or 4 times already). So after 2 weeks of hearing nothing from you I had assumed the credit card account was closed. Yesterday at about 5pm I get a call from one of your consultants (she had said her name too fast for me to catch it) had phoned me firstly asking if I'd like to reconsider, to which i had said no because you have given me bad service and I plan to go elsewhere. Then she says i owe you money??? for an account that was open not even a week????? that you had blocked because you haven't received the documents for???? after i sent them 3 or 4 times??? Then when i said it needs to be sorted out yesterday, she says its after 5 and no one can help now. So you people can interrupt my evening to bother me for money that is not owed to you, yet you can solve a problem at the same time??? Please explain to me how I must pay you for a service YOU had not provided me with!!! She was meant to get back to me by 12 today, and classic FNB, i haven't heard a thing