Pathetic customer service

an unauthorised debit order has once again gone through on my Nedbank account. I called customer services to reverse the DO only to be told that "unfortunately there is a charge." that is unacceptable as to my understanding there is no other commercial bank in SA that charges to reverse a DO. Why should Nedbank charge? I asked customer services to explain to me why wasn't I notified about the DO before it went off. Their explanation was that "it is not always possible" How pathetic ! my understanding (and I could be wrong) is that the law states that the bank must give notification of a DO if it exceeds R100 If Nedbank cant fix this then I will close this account and move to another bank. I understand that all banks are problematic but in this case Nedbank cant even get the basics right. I have an account with Standard bank as well, and I do have problems from time to time, but they ALWAYS sort it out when they are at fault.