Builders flashing

Was looking for flashing. Saw on builders wharehous site that they have the specific ine looking for in stock. Drove 30 km to builders. Looking for flashing could not find it ask for assitance. People said none in stock but web site said 10. After management was requested and 45 min later they found out decription on web site was wrong. That size is not aveilable. Very bad from big company to have such errors on sites. All they can say is not their fault.