Kindly provide us with 2 screenshots so that we can submit it back to PSN support to troubleshoot your issue:
1> Screenshot of your order showing the code you have received
2> Screenshot of the error you received on your PSN account during redemption
Kindly do not crop the pictures and attach them to an email with your Order Number as the title and email it to firstname.lastname@example.org
It seems that the PSN support team notified that both codes purchased have been used on the same day of your purchase, after you have viewed the code. Kindly refer back to PSN support for more info.
Have a great weekend.