I am so sorry you have been screwed around but at this point take your money and run. It all sounds way too slimey for my liking. I appreciate the fact that you have gone above and beyond to help this pup but they obviously are hiding something. I hope you find that pup to rescue for it will be very lucky to have an owner like you.
A dog has so many friends because they wag their tails not their tongues.
R.I.P. Buddy 2002-2008 The best Mastiff ever.
Now owned by Clark the Crazy American Bulldog