Scribd Inc. Software Engineer interview questions

I applied on their site and was contact by a recruiter about a week later asking for my availability to schedule a call. "Our team is looking forward to chat about next steps!" She said. I provided my availability and no response. I waited a few more days and sent a follow up email. Still no response. I'm not sure if this was a mistake on their end or just they're plain unprofessional but it looks like I'm not the only one this has happened to.