Closest I've been to this situation was a couple of years back. It wasn't nearly as bad but my response to it was important.
I was promised an audition which never happened, just didn't hear back... until...
I got a call saying they hadn't bothered to audition me or anybody else as their regular dep has changed his mind and decided he wanted the full time gig. However he wasn't available for new years eve and could I maybe step in? Oh and it doesn't pay very well, it's for a pub which lets us rehearse for free so we play cut price for them.
I could have said all sorts of rude things but I didn't I took the gig and gave depped for them many times since, am in a band with the singer who also got me a regular gig in another band with her recommendation.
So yeah, stay cool, keep the contact, you never know.