Maybe not. Keep the faith.
And maybe call back? Tell them, "you caught me off guard at work where I wasn't free to speak? And I'd like just another moment of your time to tell you why I want to work for you?"
One time there was a job I really wanted. I was given the company president's name/phone to call. I called, got voice mail, started in on my spiel and when I got to the part of "I got your name/number from ..." my mind went BLANK. For the life of me I couldn't remember the name of who referred me. I stammered and stumbled and then almost gasped in horror when I realized that ALL OF THIS WAS BEING RECORDED!
Ack. So I stopped. And then said, "I'm sorry, but I just totally lost my train of thought." And then the name came to me and I went on as if there wasn't a good minute of nonsense at the beginning of the voice mail.
And I got the call back. And I got the job. And that company president is still one of my closest business contacts/mentors.
Sometimes showing how you handle "adversity" can be the ticket.
Take heart! You haven't been aced out yet.