HELP! my brother did cash-for-clunkers and now the dealer wants more money.HELP! [View All]

http://www.cars.gov/

I suspect a ripoff in the works.

According to the website,my brother qualifies if the new vehicle gets 10 MPG better than his old vehicle.
old car;1988 Buick Century,2.8L V6 3-sp. auto
new car;Nissan Versa BASE model 1.6L 5-sp. manual.
We spent hours at the dealership Thurs. evening while they did all the paperwork.
Since my brother lives with our older sister and gives her rides/helps out in general,she put up $5000 cash.
brother put up Buick for C-for-C program,which they accept,and they tell him he qualifies for the full $4500 credit,not the $3500 he originally thought,and puts the rest on his credit card so it's paid for in fulll.
NOW they call him up and say they want more money.
AAAAAAARRRRRRRGGGGGGHHHHH!!!!!!!!!!
:mad: :mad: :mad: :mad:
:grr: :grr: :grr: :grr:
:argh: :argh: :argh: :argh: