Bad service continually

I have been calling FNB card division and FNB enquiries for the past two weeks in order to attain my settlement amount for my credit card with FNB. I have received no response from them since. I sent an email to the admin email address which promised a reply within a certain period but has since not contacted me. I have laid a complaint at the FNB website and they have not contacted me since. I have also requested all the call centre agents to ask their managers to call me or to call me back with feedback and this was too difficult for FNB to do. I have visited one of the FNB branch and paid off the settlement amount on the credit card, asked them to destroy it and close my account. The manager at the branch said that he will email the card division and tell them to send me a closure letter ASAP and this as well has not being done to date. All I want from FNB is a closure letter today, this is the least you can do for the pathetic and unfriendly service I have received. Highly disappointed with the way I have been treated which led me to close my accounts. FNB's motto is how can we help you, but so far it seems FNB can't help anyone!!!