Very disappointed in Hudson Bay. I purchased a nec...

Very disappointed in Hudson Bay. I purchased a necklace for my girlfriend online which she wanted to exchange for another item. I did not keep the receipt received in the box as I though the order number would be enough however, since it had been 31 days (one day beyond their return policy) they would not allow me to exchange the item for something else??? How does one of Canadas largest retailers survive which such poor policies???