To clarify, as this topic can get complicated really quickly.
If a shop takes a CC-NC design and makes it an sells it to you (by request or otherwise) it’s similar to a printshop printing a pdf of a copyrighted book.
It’s exactly what @vicious1 (the licensor) said, the Licensor is the only one able to make money in any way with the licensed work (the design).
I’m not sure if the person at fault is the requestor or the shop, If you didn’t specify the file you provided is licensed and you knew the work was licensed then It’s probably you.
These are the sources I’ve consulted on this:
https://creativecommons.org/faq/#does-my-use-violate-the-noncommercial-clause-of-the-licenses
https://wiki.creativecommons.org/wiki/NonCommercial_interpretation
https://wiki.creativecommons.org/wiki/Defining_Noncommercial