Nothing but your trust was breached here. Unlimited data is not a contract to start with....

Direct from your Contract:

"This agreement and the documents it incorporates form the entire agreement between us. You can't rely on any other documents, or on what's said by any Sales or Customer Service Representatives, and you have no other rights regarding Service or this agreement. This agreement isn't for the benefit of any third party except our parent companies, affiliates, subsidiaries, agents, and predecessors and successors in interest. Except where we've agreed otherwise elsewhere in this agreement, this agreement and any disputes covered by it are governed by federal law and the laws of the state encompassing the area code of your wireless phone number when you accepted this agreement, without regard to the conflicts of laws and rules of that state."