Wow that's super odd but we do everything we can to figure out what happened. Does the usage show up for other lines? Can you tell us where you're going on the site to look up the activity for this line? Please take a look at our Set up My T-Mobile permissions to make sure your main line is set up properly.
Hi there. Please take a look at the link I posted and let us know if you're able to view your lines' activity.