when is this store getting it's act together

Was just at Pick n Pay had had this horrible experience with the cashier Nadia that had a stinking attitude. Customer in front of me bought two bottles of wine of which one wouldn't scan. She refused to ring up the one bottle and continue with the queue and instead I had to wait for another seven minutes before the queue moved. Then Nadia had the audacity to argue with me when I suggested she move along with the queue. This Pick n Pay is so busy but their service is extremely poor.