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

Don't get me started. I was extremely frustrated to hear this news on top of all the other things that I've been going on with T-Mobile. I have spent hours each month in the store, trying to correct the overbilling the assurance claims the adding numbers adding additional lines to my account without, approving it overcharging, losing phones directing complaints to assurance only to find that assurance won't deal with it and now this I have removed my auto payment because they were overcharging me for phones that the store lost. They were also charging me $75 additional for a phone line that I did not approve , it's taking a long time to correct all of this. I have removed assurance and I've removed auto payment so they cannot abuse now they decided to charge this plan. That is the only reason why I've stayed with T-Mobile. They've tried to get me to change this plan and upgrade, but I have kept this plan because it was locked because it was never supposed to go up , I'm supposed to get a phone call from a supervisor I spoke to this morning in the Philippines. He is going to ask L and escalate my case of requesting it not to be increased and I should hear back tomorrow. I am going to escalate this outside of T-Mobile as these companies should not be taking advantage of people over 55. I am now 66 and  Should be able to rely on companies that I have been a loyal customer for more than eight years. 
I am interested in others who would like to take action steps. Please let me know. Thank you.