I don't and shouldn't have to care who the supplier is or what kind of agreement they have with the store; I am conducting business with the store. My contractu

I don't and shouldn't have to care who the supplier is or what kind of agreement they have with the store; I am conducting business with the store. My contractual interactions are with the store. It process the orders, handle payment, shipping, etc.. I don't get how they can claim otherwise.