Disappointment

I have lost all credebilty and trust I had for Pep store at Maponya Mall. My grandmother went to do money transfer on the 5th September 2019, when the cashier was done with the cash send my grandmother requested the cashier to assist her with sending a sms of the pin and voucher number to the person she was sending the money too, cashier took the phone and sent thesms to her self and deleted the message from my grandmothers phone, she then told her that she was unable to send the sms, when we tried to go withdraw the money, we advised that withdrawal was already done at Absa in Maponya mall 20min after depositing the cash. I went to speak to the manager to inform her of what had happened, The Manager told me that am not the customer to come with that complain, there is nothing she can do if there system is hacked. The cashiers name is Phindile I am not sure of the managers name.