Pre-hung 6panel closet door(interior)

We recently had carpeting removed and hardwood floors installed. What is "acceptable" clearance for an entry door? Our front entry door, which is 104 years old, original to the house, was "trimmed" by the installer. However, it now is at an angle, and is 1 3/8" above the floor on the side of the door knob and 3/8" on the hinge side. Needless to say, it looks terrible. The installer tried to justify it, saying that the floor is uneven (which is true...but not that much!) and that in the winter, the floor would swell, so he had to make enough clearance so that it wouldn't hit the floor...What are our rights and options at this point, in regards to either repairing (I doubt that is possible) or having the installer replace the door? What really bothered me was that he did those cuts without asking us how far we wanted to be able to open the door, or how much we wanted taken off...What is standard, professional practice in such cases? Thanks for any help you can provide.

Hello. My closet bifold doors will not close all the way, but enough to cover the opening. This happens becuase there is a lot of paint buildup between where the doors close. I bought a new track kit and it came with new hinges. So I wanted to install those hinges to better increase the gap between the doors by an eighth of an inch, but my closet doors are kind of a hollow metal material, from inside the closet you can see the insides of the door. I was wondering how I would screw new hinges in a thin metal?? It is not like hollow wood doors. By the way the hinges now are welded onto the door. Maybe there is something that can sandwich the screw to the door....like back clips?