You can discuss it with the merchant first and see what is wrong.
Spouses are legal representatives of both parties. Because of your identity, it is legally recognized that she can represent you, so it is valid to sign your name, which means she signed for it on your behalf.
Or you can see if there is any evidence that you didn't receive this at that time, so as to overturn this receipt. Otherwise, you will bear the responsibility of signing for it without inspection.