I have one supermarket delivery a month. I always order 40 cat food pouches.
Delivery due later today, received email this morning saying they did not have a box of 40 so are sending instead one box of 12.
I would have expected 3 boxes of 12 (= 36 pouches) as a sub (or even 4, making 48). So I phoned them and asked why they had not sent more than one box of 12. Their answer astonished me: they only sub "one for one", regardless of how many individual items the customer ordered.
So if a customer ordered a box of 36 Coca-Colas, they could sub that with one can of Coke.
AIBU to think that they ought to send as many packs as needed to fulfill as closely as possible what the customer ordered?