Cant close account

I have been trying to close my account for about 4 weeks now, calling every couple of days. There's always some reason why I cant close the account, the latest which has been going on for 2 weeks now, I have a R1 pending authorisation on my card from a few months ago, I have no idea what this is for. I have had to fill in forms to have this reversed. This form somehow got lost at FNB, I then had to resubmit and now every time I call they are still waiting for this to be processed - two weeks later. But...When I talk to the callcentre they say they will follow up because it will only take an hour to reverse, and they will get back to me. For the last 5 working days I have called everyday, and not one person has got back to me!