Incorrect bank charges not reversed

My Go Banking current account was hit with unexplained bank charges during the month of July this year - no communication from Nedbank about this change, no apology for what turns out to be their mistake. I enquired at branch level, via online customer service, and in email correspondence with customer care as well. I sent a full list of my contacts and complaints to their complaints email address on 14 August. Still no reply. Still no acknowledgement. Still no reversal of the bank charges. My experience with Nedbank is that they do not appear to care about individual customers as reflected in their poor communication, lack of follow up and failure to correct their mistake.