Pity service for delivery by Ubereats.

Pity service for delivery by Ubereats.
I just made an order for 2 pizzas and they just sent me
Deliver one and when I call the store to claim the other
They tell me that they don't know what happened but that I go to pick up the other wing store, how will I go through it if I don't know why I use Ubereats. And they don't even apologize.