T-Mobile forces customers into arbitration unless you've opted out. Probably straightforward to arbitrate based on terms, but I recommend filing an FCC complaint. Regulators light a fire.
https://consumercomplaints.fcc.gov/hc/en-us
Go to Phone > Billing (or go directly from here) https://consumercomplaints.fcc.gov/hc/en-us/articles/3600012...
Phone Issues: Advertised Rate
Text box content:
T-Mobile is forcing me to upgrade my mobile plan even though I signed up with
their advertised Price-Lock https://www.t-mobile.com/support/account/price-
lock
There is no option to opt-out as of $today's_date. This is a violation of
my contract, and they are relying on the fact that most consumers do not have
enough knowledge/time to call in and argue with customer representatives for
hours. https://www.fiercewireless.com/wireless/t-mobile-will-migrate-
customers-higher-cost-plans
T-Mobile is also forcing customers who want to opt out and keep to their
current contracted plan to listen to an unsolicited sales pitch -- this may
violate telephone advertisement and spamming laws.
While the company claims that customers can opt out, multiple customers have.
reported that phone reps refuse to allow opt-out when they call, which is in
general disingenuous behaviors. I believe that the FCC should force T-Mobile
to provide this option through email or an online menu.
FTC complaint can be made here:
https://reportfraud.ftc.gov/