Double charging for petrol (dishonesty)

Be cautious when you fill up at BP Heritage Park (Somerset West). The machine was out of paper and the manager insisted that the transaction did not go through, although it stated approved and was confirmed on the banking app. They forced us to pay for the fuel again with the undertaking that should it go off twice, a refund will be done. A week later, we forward the details (bank statements) that both transactions did indeed go off. A month later and they refuse to do any refunds stating it is the "bank's fault".