I have never heard of any of these things happening, ever. The only explanation (and I'm not saying excuse) is that the stage manager forced their hand by one, not allowing them to open the house and then two starting the show without their ok. That would also explain the ushsers attitude to sit anywhere. They very well felt shat upon.
Which doesn't make it right.
I would have asked to see the House Manager at intermission. I would have demanded my seats at that time, as well. At this point I agree with the above poster that tells you to send a letter-to the house manager, Jujamcyn Corp and the producers of the show.
As also mentioned above, there must have been hundreds of people behind you, and you couldn't have been the only person with this complaint. But this is the part that makes the story sound odd -- there would have been HUNDREDS of people without seats, where were they all standing during the first number? I can't believe they could have gottenn house management to keep them all quiet. But if all as you say is true, they will be getting MANY complaints -- certainly not from everyone, but from enough -= to back up your story.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.