Stand your ground + pay him his original quote. A lot of accountants seem to charge more than they quote. Foreign accountants are amazed at what some accountants here charge and get away with....all part of rip off Ireland is the kindest explanation.
Same goes for foreign
dentists -v- irish dentists
car prices -v- irish
etc. etc.
On radio today it seems home improvement costs, getting a plumber , electrician etc. is, in some cases 1/2 that it was a couple years ago. There are more than just accountants out there whos prices are different to other countries.