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

Just went thru the same "Your current plan says nothing about a Price-Lock" goat rope with a young T-Mobile Customer Svc Rep. Sadly, he's the one that has to to endure our rath. Anyway, after sharing I'd enrolled in the (Then) Senior Unlimited 55+ Plan, that included a "Guaranteed Never to Go Up" Price-Lock back in December 2017 AND I needed to know why it's now called "One Plan 55+" and there's no longer a lock. Told him I wanted an email address that I could send my concerns to, toward resolution, and was informed there are NO T-Mobile email addresses, but he would be happy to transfer me to his Tampa Supervisor. I gladly accepted that offer and eagerly awaited the end of the Elevator Music, which not surprisingly never ended,  I hung up after 15 minutes. I will be doing the 611 thing AGAIN, and this time tell a Supervisor (among other things) to Read the discuss on their Community Page. I may need to give him/her the link to the page.