Standard Bank Bluebean

So my mom got slammed on the 12 October 2018. Lost all the cash she had and the bank cards she held. She was alone, we were all at work and we don't use our phones they stay in the lockers and she had no one to drive her to the banks. My mom then called my sister who works at SAA to help her get a hold of us that live close to her. My sister then called Standard Bank and asked them to close all mom's account cause she got Slammed, They didn't close the blue credit card cause she didn't have the account number. The guy had already withdrew 3500 from the account by then.

We went in with mom when we saw the calls and close the account same day a few hours later and they said they will investigate. Now they called her and said she reported after the guy had withdrew from the account it's non of their responsibility she has to pay it.

To my fellow Peter community what steps can I take from here?

Another thing if my mom's Standard Bank pin is a secret and only known to her, how could a **** withdraw at am ATM with her pin? Unless Standard Bank does not care about it's client enough to investigate who got into there system on that day to view mom's account and password.

Unless if there is a universal code we don't know about. Clearly someone from their departure is working with ****s and they just don't care...