Burger King review: Product unavailable during promotion

On Wed, April 14 around 3pm I went to Burger King located at 605 N Hwy 190 in Covington, LA. After waiting in the drive thru line for 10 minutes behind 2 cars, I was informed that they were out of the Impossible Whopper.
Tonight April 15, I returned to the drive thru at the same Burger King at 8pm. Once more I was informed that they were out of the Impossible Whopper.
I feel that management should be cognizant of this issue and that sufficient stock should be available during a promotion of a product.