the battery not charging message stays even after unplugging the usb-c and still will not charge when plugged into the known working cord.

The support article you came here from should provide you with the steps needed to try to resolve this issue. Have you tried them all yet? If so, and they didn't help, I suggest that you contact Apple Support directly. To do so, simply select the "Support" link in the lower left-hand side of this forum's web page.