Staples does not Understand "Now"

This morning (August 20) I received an electronic reminder from Staples. It informed me that, as of August 14, I had not used to rewards I had accrued for recycling my ink cartridges. This was true. However, it overlooked the fact that I had used those rewards on August 18. What is it about their software that is oblivious to transactions that took place within the last 48 hours?