This was a big problem for me, too. I literally had to *hound* them about it. Once I told them that I couldn't get them their money and would have to cancel the delivery date unless they got me a correct PA, they finally got the ball rolling. It took them five attempts before they finally delivered a correct PA to me, which I could then forward to my CU for financing.
When you do finally get a PA, make sure you look it over carefully. Make sure it is correct before you forward it to your credit union.