NOT: LOWES: 20-Minute Pick Up In Store Guarantee

LOWES: exclusive 20-Minute Pick Up In Store Guarantee:
Ordered 5 fence posts online via Lowes web site at approx. 12:56P.M.EST today. Got there at 3:00P.M. approx., and order not ready, and no one knew anything about it, nor were familiar with internet orders.
@Lowes where is the guarantee?
Not the 1st time I've had poor customer service at the same store. I ordered floor tile the last time, and was treated very rudely, by someone that appeared to be in management.