Failed Security questions despite correct answers.

Once again I failed ABSA's security questions. Absa says it cannot correct their wrong answers as it's "system generated", andf they can't get into the system, but their system has incorrect information, eg property ownership: one property was even placed in the wrong province! It also asks how long I've had my cellphone account? How should I know whether it's 18, 19, or 14 years? And have I ever had a phone number xyz? Possibly that was a work number from decades ago....how should I know that? Even when none of the questions were these impossible to recall ones, ie absolutely factual, like DO you own a property in xyz, ABSA rejected my absolutely correct replies. Bad data is being put into their system causing legitimate customers to fail to be able to contact ABSA.