Boxer Superstores liquor diepsloot

Today i went to boxer superstore liquor store at Diepsloot branch, as they were running a special of brutal fruit, we went in to buy and we saw what we were looking for. We tried to buy the stuff however we advised it was already paid for by the staff members who were still working. My concern is why was the stuff not moved from customers view because if i see something that i want as a customer i must get it. The manager was not even apologetic about that she just said it was paid. What a poor service