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Disclaimer: IANAL
Contracts in perpetuity don’t hold up, especially since this isn’t even a contract. They always expire at some point, unless renewed.
A claim of false advertising could hold up, but again that’s a promise not held in a contract.
Finally, it looks like that marketing campaign was over 7 years ago. No court would ever hold them to business plans from that long ago. They have to provide adequate notice for any changes (often 30 days), but they can certainly discontinue a program.
Pretty sure the original contracts have all expired, and these are now month-to-month renewals. IOW, when the current contract expires at the end of the month, it will not be renewed by T-Mobile. They are offering a similar, slightly modified version (at a higher price) if you would like to take them up on it.