T-Mobile breaking promises to seniors who were offered price-lock guarantee for life on 55+ rate plans

Hi All, I live in Washington State, corporate home of T-Mobil.  I sent a complaint to the state's attorney general about the increase in the rate for the 55+ plan and the broken corporate promise never to raise rates.  The complaint qualified for their "informal" dispute resolution process, meaning they couldn't do anything legally, but forwarded my complaint to T-Mobil.  I received a call today from a corporate spokesman to talk about the referral from the AG's office.  I spoke to a very accomplished customer service person, who listened to my complaint (for me it wasn't as much the $10 per month increase, but the broken promise of never raising rates).  He heard me out, wasn't defensive, and indicated that the plan I signed up for in 2017 was not the price lock guarantee plan, but rather a different plan, which, like all of you, wasn't my understanding.  He made sure I knew he wasn't a decision maker about changing my monthly charge, but would take it up the corporate ladder.  I noted to him that TM has had record corporate profits in 2024, which just makes this even more maddening.  I also made sure he knew about this chat group and suggested he read the comments.  I'm not seeing any desire to change this plan back to the original, promised rates.  My next thought is to contact AT&T, Verizon, and Xfinity to suggest that if they offered the same TM plan at the original $30 per line, they would probably get a lot of converts.  Bet someone could come up with a really effective marketing campaign about how TM bait-and-switched us and broke the promise.