Ah sorry now I understand what you mean. Then no, you should be able to hear those. It is a known bug however and if I was you I'd contact support and keep relogging until it comes back. If that doesn't work you can hear all the voices on youtube vids and perhaps choose one off there.
I don't believe there is a repair tool for X box, at least that's what I'm told. This thread was about a PC issue, where you can do a repair from the game launcher.