Double Debit

Just when a person think that it was save to allow debit orders to run from African Bank, an issue creeps in. Is it theft that after arranging amounts with African Bank and they do run it correct but then suddenly the next month that an amount bigger than what they have been authorized gets deducted from my account? As this is now a problem as that now causes other debit orders to fail. Upset about this yes I am, but more wondering if the person responsible for this theft out of my account will be punished?