First, I doubt if the doors are warped. Normally, the slab itself is fine. It's the adjacent wals that were likely framed slightly out of plumb, and the finishh carppenter was too lazy to either 1) fix the framing or 2) install the jamb plumb and remedy the out-of-plumb when he cased the door.
Best bet? Send your builder a certified letter, return receipt requested. Document everything in the letter...problems, when discovered/disclosed, etc, etc. No emotion, just facts.
Tell him what you want.
Tell him when you expect a reply by, say 5 or 10 business days.
You need to figure out what you want and how far you're willing to go to get what you want. Everything from a letter to the better Business Bureau to Small Claims Court.
Still, you need documentation to stand on. Ae the doors warped/twisted, or is it just the jambs that were installed out of plumb? You can find out with a level.
In the end, it doesn't matter if the doors are "built to standard" or "installed to industry standard." Your doors don't work as they should, and with doors being soomething you will touch and use every single day that you live in the house, your builder should have more commen sense and integrity than to simply blow you off.
You can mask the poor installation by pulling the stop, closing the door, and reinstalliing the stop. Still, if it's severely out of plumb or terribly warped, the stop may not look good running up the jamb at an angle.