One thing you can do is describe the problem, because there may be people in these forums who can help.

Until then, your Vox is useful for plenty. It accepts non-DRM ePubs from third parties. You can install a reader like Aldiko to read DRM ePubs (including those from Kobo). Throw on a PDF reader, and it will work nicely for that. If you're really frustrated with Kobo, lash out at them by installing the Kindle reader!

(If you can't get past the registration process to do that stuff, just create a temporary account until your problem is resolved.)

Finally, one piece of advice: asking questions will accomplish more than venting.