Can't close accounts!

I have moved overseas recently and have since decided to close my accounts. I spoke to a call centre agent who said I needed to get a power of attorney for the person who would be closing my accounts to take with to the bank. However, the bank now won't accept these as they are not the originals! They are notarised and certified by a lawyer though... i was told to email the bank a request to close my accounts (obviously much more efficient to combat *****...) having sent emails to nedbank and not received any response I don't know what to do! I have transferred all the money out of the accounts and just want them closed! Is it always this difficult? It seems like no one works at the bank or checks emails and thuse that are working can't give me the correct information! This is a useless and money-hungry bank...