All you can do is to keep trying...but I'm not sure what they can, or will do.
SO you've learned a hard lesson that many people need to keep in mind, and that is to come back into your tax file every week...AFTER you have filed, and keep checking to see what the status is...don't depend on an email notice from TTX (100's get mis-directed due either to people mis-entering them...or they get in their Junk folder and never notice.).
All you can do yourself now, is to print out your NC tax file, sign/date it and send it in by mail to get processed (along with any W-2 or any other tax form that shows NC withholding on it). Be sure to use a tracking method at the Post Office service counter.
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IF you can't find the address....see the bottom of page 7 of the 2019 instructions:
https://files.nc.gov/ncdor/documents/files/2019-D-401-Instructions_0.pdf
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
