How can I solve an Error 005-5602 when I enter the Nintendo Shop?
This is what it means:
An error occurred while attempting to connect to the Nintendo eShop. Power off your system and try again.
If you continue to experience problems, please call 1-800-255-3700 for assistance.
They're closed on Boxing day? Wow, I thought they were open. I bet they'll be open tomorrow.
And to answer your other question, you can always email them through the webform.