Resetting of Nedbank ID

For the last couple of months I have been attempting to access my greenbacks account with Nedbank ID. When logging in, I get a message that I am not registered and that I need to register. When attempting to register, I get a message I am already registered. I have called the helpline, where I have been told to try logging in on different browsers, that I am indeed registered, that the site is being attended to by technicians, that I can call the Greenbacks line where a consultant will help me convert my points, I have been transferred to supervisors who then suggest the same solutions to the problem as the call center. It seems that there is a serious technical issue that is not being attended too and that I am being given every possible solution to the problem except for the one that works and it is very frustrating. Where to from here?