Not signing depends on whether the signer has legal or agreed authorization. In view of the fact that it is your wife who signs for it now and is your legal representative in law, the signing for it should be valid.

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.