What happened to the unlimited data on T-Mobile simple choice grandfathered plan

Within the last week we have no data at all. Two of our lines have an extra data package and they are the only ones with data. We are on the grandfathered simple choice plan with unlimited talk text and data we've been on this plan for over 17 years we received either 1 GB or 3 GB of high-speed data, and after that, it slows down. But now there's nothing!!! when I look at our account the plan now reads simple choice unlimited talk and text. What I want to know is, did T Mobile just change the plan? is it my account only? Is anyone else experiencing the same thing?