Not able to decrease overdraft(i.e. close the overdraft)

I see this has been reported before, yet still a problem. I wanted to close my overdraft(i.e. decrease it to R0), but I got an error stating it can not be lower than "1". So I set it to 1, but then get the following error: Error code: 14323

Please sort this out, as I have paid it off and want to remove the overdraft! I no longer live in South Africa, so I am not able to phone internationally. I have provided my Canadian number, but can not add a +1 to it as it only allows 10 digits