personally, if you paid by credit card, then (call your credit card company) and dispute the charges, telling them that you are having issues with the purchase. that'll hold back the money for at least one, if not 2 billing periods from him, while the CC company "investigates".
then YOU CAN fax of via email, send them all the correspondence between you 2.
you may still end up paying, but you'd be screwing with him financially.
honestly, i think he deserves it too.
he needs an attitude adjustment, you can also go to "rip off report" and file a complaint with him there, and his state's BBB
if it were me..??
i'd know how to make his time in his office, uncomfortable...legally...which are the ways i pointed out