TMobile app not ready for you...

I've called T-Mobile at least 4 times with this exact same complaint. Every time they tell me "it's now fixed and I should be able to now use the app"

  I've tried every work around that I've read. I've tried T-Mobile dot com. 
  Still nothing. I just don't understand how a cell phone provider as big as T-Mobile can't get an app to work. I can't even log onto the T-Mobile website from my IMac computer. I really don't understand why this is so hard.