Disgruntled customer

Well Builders Warehouse has outdone themselves yet again. They delivered one part of our order on Friday. The other part of our order Saturday afternoon without any notification. The truck just pitched up in front of our house randomly. What if we were not home? What would they have done then? Left the building material outside on the pavement? Today I received another message stating that our order will be delivered between 1 - 3 days. This is an order that was placed last week Saturday. Why do they not put everything on the truck onetime? I would think that it would serve them better to deliver all the items in one go. We on the other hand cannot continue with our project because we have to wait. This is a major inconvenience to say the least. Builders Warehouse has to really come to the party if they do not wish to loose customers.