They did something similar with me. I had 2000 text messages without additional cost (2000 TXT ALLOWANCE was the name in their system). This plan was TXT only and MMS was an additional charge each which I was fine with. Been using it all these years up until last year. This was when they were trying to get everyone onto an LTE phone. Even though my Droid 3 was only six months old, they were willing to give me a Droid 4 for free and reset my 2yr contract start date. The CSR swore up and down that nothing would change on my plan and they could always put it back. That's when they dropped it.
I called to get them to put it back on, but was told it was "incompatible with your phone". I tried to get as high as I could. I even filed a BBB complaint and the best that rep could do was credit me a TXT plan for a year. I was told in their system it was marked as incompatible and it wouldn't let them put it back on. There was no way to talk with a DBA or anyone else on getting it changed. That was the last bait and switch I was going to tolerate from them; after nine years, I've ported my numbers out and suspended my lines (they don't charge for this BTW).
I guess I better get on to selling my grandfathered Unlimited Data plans. I've been slacking on selling them and have been happy with T-Mobile for three months now. Although they did get my preordered Note 3 to me a day after launch, but I know better next time.
Fuzzball. could you explain how someone goes about selling their unlimited plans? I have 4 that I will be switching from very soon.