Poor service Standard Bank Centurion Lifestyle branch

My little sister opened up Women saving club around 2024, the account has over R80 000 this was opened with colleagues at work. Life happened, two of our signatories now former colleagues are no longer within our employ ( this can be confirmed through our HR due to employer / employee relationship) ex colleagues are no longer taking our calls as we wanted to make arrangements to have them replaced as signatories. We asked our HR to put some confirmation for the bank, no one wanted to see that document. Our savings are now stuck with Standard Bank and Centurion Lifestyle said we must send an email to risk without any guarantees that this will be resolved, we use our lunch time through this process. Should we perhaps advise Life Style branch that since we can't locate those members some form of sworn affidavits from police station will do? i wish we could have gave them such advise but since they didn't want to see our HR letter this is our last option. We will be moving those funds into other customer caring banks,