Bogus banks milking on unauthorised debit orders

My father was banking with NetBank and passed on, in September 2019. He had R3100 left in his NetBank account and when my mother went to collect it, they said they can only give her the money through a cheque or opening her a NetBank account so that they can transfer it and she can close the account after withdrawing the money. After all has been done to open that account then the money was withdrawn and when my mother wanted to close the account, now there are debit orders in the same account which caused the account to be overdrawn with extra cost on bank charges of unpaid debits. My mother payed those negatives so that she can close the account. the next day she receives a message from the same account that other debits where busy and now as we speak, the account is sitting at R900 dr since September when my mother wanted to close it.