Nedbank service nightmare!

I have a Nedbank saving account that I use strictly for saving, there are no debit orders loaded on this account but over the last 2 or 3 of month there have random debit orders going off my accounts. I have been contacting Nedbank to reversing these debt order, when I spoke to the consultant last month he advised that she had cancelled the debit orders so they wouldn't go off again. The debit orders have gone off again this month, Nedbank reversed the debit orders because there where no funds in my account but charged me an 'unpaid fee'. My account is now sitting on -R111 for debit orders that I did not authorise and requested to be cancelled. It is now my responsibility to pay for charged billed to my account for debit orders that I did not approve, which I find completely unfair. I was advised my the consultant I spoke to today that I can not reverse the debit orders and in order to reverse the fees I would need to go into the branch . I an very disappointed by the service I have received from Nedbank, I didn't need to go into the branch for them to charge me fees on my account for invalid debit orders but now I need to go into the branch to reverse the fees. This is absolutely terrible customer service, why do they even have a call centre or online banking if I still need to go into the branch? I would like to report this to the consumer ombudsman.