Poor Service-Freezing Cell Phone Banking without prior notification to clients

I have been banking with ABSA for over 40 years and the bank has now blocked me from utilising cell banking due to my FICA being outstanding. My information has never changed since I opened the account so how can my FICA be outstanding . The worst part is that in terms of treating customers fairly , the bank was supposed to notify me in advance prior to them freezing my cellphone banking. The best part is that I need to go into a branch or go online to update the FICA. When I try the do this on their online banking , when I try to log in, the system just kicks you out stating that there is no accounts. This is totally unacceptable and need ABSA to urgently rectify this.