Was on the phone trying to sdc to a flight 24 hrs later.

my flight was at 140 PM
I wanted to switch to the next day 140 pm and agent declined so I asked her to switch me to a flight that was Within 24 hours. I told her I would call back later and switch it again. She replied there are no flights available today I'll have a look and see what I could do for tomorrow as you are trying to Game the system.
I replied and said I'm not trying to game the system I am using my benefits for being a loyal United 1K customer.

To make a long story short she said UA will be changing SDC rules soon. You will only be able to move the flight one time and only move it ahead not push it off. Hope she was wrong.

Anyone else hear something of this nature?