Unauthorise debit orders

I have been a loyal customer of Standard bank for more than a decade now, but I am at the stage where I really need to swich banks with immidiate effect. I feel that my account has been opend to ***** and unfortunately the bank is unable to help or give solution. I have unauthorise debit orders that are going through my account on a monthly basis - where some succeeded and some returned unpaid and I am liable for those unpaid fees. I am holding the bank reliable because it means my account is not safe nor protected by them or they basically leaking out or selling our details to anyone who would bring money in. I have called and spoken to these companies that said they debiting or collecting on behalf of other companies, e.g: Statcol on behalf of SMV Enterprises and Digicash of others that I had to pay. The bank could not make some reversals because I realised after their *stipulated time*. I am just concern by the easy access that these people get our info and amazingly all these companies that are collected on for are from Durban whilst I live in Johannesburg. I really hope this particular bank tighten up their security or I wouldnt be the last leaving it and competition is high