Exhausted

I am trying to get 2 debit orders reversed from my account which were not meant to go off . The debit orders are from Nedbank. I have called the call centre 7 times and have been tp branch twice. Nobody can help me. My account is sitting in a minus because of this. I do not use this account. I cannot understand how this is such a complicated process. All I want to do is have the debit orders reversed and close.my account.