You would have received an automatic auto-response - if you did not than either your email didn’t reach them, or theirs didn’t reach you. Check your spam folder and make sure @glowforge.com is in your whitelist. It would seem odd as you’ve clearly had communication with them prior!
It may very well be the black cable, even if you replaced it, but looking for other things it doesn’t look like you tried a different WiFi so go through the steps here and see if there was anything you haven’t tried: