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

I am really disappointed with T-Mobile raising prices for seniors when we were told they wouldn't ever increase our rates. We cannot let them get away with this. My internet  also came with a price guarantee and they will most likely try and raise that next. Flood the Better Business Bureau with complaints because their rating will go down with them if they don't try to resolve customer complaints. Also contact agencies and president mentioned above. We need to have our voices heard!