So I ordered 2 packages: If I call the post office and provide the tracking number, will they allow me to pickup?

I got an email from the company I ordered from saying that it couldn't be delivered due to insufficient address.

Not sure how one got delivered and not the other.

Will they give me my package?

What happens if it gets sent all the way back? Will I have to pay again for shipping?

EDIT: so I reviewed everything, the address was/is correct. I have my phone number on there and everything...