Nebank-failure to respond to queries and to resolve system glitches

For the past year I have been receiving credit card statements from Nedbank with charges relating to an additional card fee. I was informed that this was a system error and that the amount related to a maintenance fee. Despite reassurances that this would be corrected, the error/system glitches persist. This month, in addition to the additional card fee a finance charge has been added despite the balance on the card being settled in full. The online consultant undertook to call me to discuss this over a week ago. I have yet to receive a response. The gaps between what Nedbank promises in terms service delivery and what is actually being delivered are unacceptable. I have also logged numerous complaints but other than receiving reference numbers Nedbank has failed to respond. I am frustrated by having to constantly query the line items and I am sure that this is not the way in which Nedbank wants to do business. I would like to see the system glitches and my query relating to the incorrect finance charges addressed without further delay.