Cashier made me pay twice for a transaction at PnP Express on purpose

I just went to Pick n pay Express Vanderbijlpark to purchase a drink and received the worst service ever. First I am made to wait while the cashier just stands there until the machine decides to automatically void and then she tells me that Capitec is offline and I should insert my card Instead of tapping it. I insert the card and she still waits maybe waiting for the machine to void itself again before allowing the payment to go through. I get one receipt and she refuses to give me thee receipt that said my payment was declined. I get to my house amd check my bank app I see a notification from pick n pay that I paid the same amount twice? I want my money bank plus the interest charges as this is not my fault but your staff's lack of attention to detail and incompetency. The lady that rudely assisted me is Lydia Matsatsi. I believe that we are paying extra there because we get the best or proper customer service even at night but it seems as if the staff that work there are being forced to sit there and not there to givee the best customer service to their customers.