[Porsche-O-Phile]

Eff 'em then. We run into the same thing with other architectural offices - most will work with you in similar situations (we're in one now, where we inherited a big job from another firm that got kicked off for sloppy performance) but some will try to screw you. Reasons vary - either they want to delay you, make you sweat or perhaps make you look bad, or they think that they can "get back at" the former client that they now have an axe to grind with (oddly usually due to their own screw-ups).

I've found that most often a cordial and open dialog about what you need, keeping opinion out of it usually works. It's an awkward situation but usually you can talk your way through it. This particular firm should get no further response from you. I'd wait for their next electronic data request to come in and then shoot back an e-mail saying "Interesting." Maybe they'll get the hint.