Not Swiping Clicks Cards

Engen Garavge Toits Motors Hatfield (1303 Pretorius Street). The petrol attendends working with the cashiers have the tendencies of not swiping the Clicks card and saying they are offline or have made a mistake and it's already swiped. The keep Clicks Cards in their pockets and swipe them. I poured R700 and was told I cannot swipe my clicks card because the cashier has already swiped it. Please be alert.