Lost of the money without withdrawing it

Hello Peter can you please help me my late mother she was having an account with standard bank last year September 2023 before my mother passed away she told me that someone was taking her money out to her account when we checked the balance it was true by that time the money was left it was R50 000+ but when my mother passed away at October we went to standard bank to check the balance we found out that there is R26 left when we ask consultant from standard bank she told us nothing she can do and by that time my mother passed away told himself that she left us with something