Credit Card Department - bad service!

I have closed my credit card account with FNB more than a month ago. I have requested assistance in closing the account immediately when it was paid up - no help. A month later, i have service costs and facility fees added and still no closure or assistance. I requested yet again for help - no assistance. I keep getting emails that an agent will contact me within 24-48 hours but no one ever calls. This is ridiculous. Once you miss a payment, it reflects almost immediately on your credit record but accounts paid up take months to be closed. This service is pathetic