Zero Service / Potential *****

I noticed various charges on my one Nedbank account. After some investigations I discovered these charges were the result of a Nedbank Business Manager in Polokwane (I am based in Cape Town) drew 12 statements on my account and were unable to provide an explanation. My concern are the following: (1) Nedbank Client Services did not even bother to get back to me on any of my E-mails; (2) What did they do with my account information?; (3) Potential *****? (4) How safe can I now feel at Nedbank? Have I been compromised to a point where my accounts could be "hacked" by unauthorized people? This is actually scary to the point that I am considering moving my account from Nedbank.