Waiting for feedback since 6 Feb 2016

I visited my private banker on Saturday the 6 of February 2016 to understand why I am paying interest on my credit card that I have 56 days interest free and why the amount that shows outstanding doesnt make sense.<br> I was told i will get feedback in 48 hours. I got a mail that doesnt make sense and ask to speak to someone that can help me. I did weekly follow ups without any success. A lady called me on Friday and while I was busy explaining she dropped the phone and never called back. On Friday 26 February at 16:30 a gentleman called me and I asked that he should call me on Monday because I was driving and asked why he only phones me after office hours. I am so frustarted that I want to close my account, the service is pathetic and It seems like customer service does not exist! What more can I do to get assistance? If I do not get a call from a senior manager before COB Friday the 5th of March I am closing my account and my wifes account and will take this further to ensure people are aware of the pathetic service FNB gives to their customers!