I noticed a few people mentioning billing issues here something similar happened to me last month when my data just cut off without warning. The app wasn’t any help, so I went through the T-Mobile phone number page to get a rep on the line quickly. They’ve got all the direct support numbers https://tmobile.pissedconsumer.com/customer-service.html listed in one place, which saved me from digging through endless menus or waiting forever on chat. If you ever need to get something sorted fast, that page actually works.