You can take it to a T-Mobile shop and see if they can do anything for it. Or you could find a third-party repair shop locally. Lastly, you could go to
Cellular Nationwide Network - 3G, Sony, Panasonic, LG, SonyEricsson, Nokia, Tools, BlackBerry, and order new parts for an in-home repair.
Probably though, you're going to have to replace your BlackBerry with another one, either new or used.