After I faxed my questionaire, it took them a while to get back to me...felt the same way you feel...so I emailed them for follow up. They responded the next day and emailed me a proof of my invite several days after that. Then, we went back and forth changing a few things about the invitation, but once the final proof was okayed by me, I got the invitations really fast.
They're really great to work w/ and would recomend them. i'm going to use them for all my paper items for the wedding.