walmart sucks-filled forms 3x, "code invalid"

I finally got through to the site. Then there were problems "signing in." Then I finally got to the part where I put the code in for the "guarantee card." The code, which I obviously just got at Walmart a few hours ago, and which has not been out of my posession, and in fact was not even displayed to another living soul until just before I got to this point, is not valid. Now I can't even get back onto the site to try again. Walmart Sucks.