Why is the system not scanning the points card on the phone

Why is the system not scanning the points card on the phone. We can be pressing numbers on the long queues. Please upgrade the system as we(customers) store our rewards cards on our phones. Cashier by the name of Tshegofatso Phasa at Pick n Pay Nkomo Village gave me attitude..she seems not willing to scan my card or help me use the points card. I ended up not enjoying my rewards(not using my shopper card)