Kyle Boatright wrote:

....
The contractor blew it when he selected the matching grade for the
installation. ...

With all due respect (tm) , I think you blew it when you accepted the
proposal w/o verifying the material specified matched your
expectations...

You probably missed any reasonable opportunity to rectify the problem by
not stopping work as soon as the first sign of trouble showed up while
they were laying it...to wait until now when the whole floor is
installed and partially finished leaves no recourse other than to scrap
the material whereas before it could (most likely) have been returned
for no worse than a restocking fee and (if you were willing to pay the
difference) an acceptable flooring substituted...