Failure to close bank account

It seems that Nedbank is either unwilling or unable to close my bank account. After 30 minutes on hold at the call center (and 2 dropped calls), I was given the details of an individual that would, supposedly, be able to assist me.

After 4 emails to this person, I have received no response and not even an acknowledgement of my message.

I just want to close my account, this should not be a difficult thing to do.