Who's inhouse watchmaker?

Get it back within the 14 days IMO, I can't see them being able to fit a genuine crystal.

I'd want to see it on a timing machine to check beat error and amplitude if it hadn't been to Rolex or Rolex approved for it's service.

If they've misled you about the crystal who's to say they didn't just put it through a swish 'n' dunk service and stick it back together with the old seals.