^^^ Oh, that stinks and I've had something similar to that happen, with my last employer.
I hated that job, and two people I worked with got a job at a government contracted shop, and they called me to tell me there was another slot opened if I wanted it. I said yes, interviewed twice and was offered the job, and I just had to wait for the official offer letter in the mail.
The next day, I was let go at my job, and I was almost giddy when they told me, because they gave me a severance package, and all I could think of was, "Haha, you jerks, I've already got another job lined up!"
Checked the mail for the offer letter when I got home...checked the next day...and the next and the next and the next. No letter.
I called my friends and asked them, they said they check for me, then I didn't hear anything from them, so I called the guy who interviewed me, and he told me they lost the funding for the third slot.
It would have been nice if they'd sent me something saying that.