Changing/updating the PRL is not hard at all... All you need to do is dial ##PRL# and enter your msl unlock code(there are many EASY instructions on how to do this) Then all you need to do is browse to the latest prl file, which can all be found for free at this site:
http://corolada.com/prl/ and chose ok. Its that simple.. and yeah.. tech support at sprint are basically dumb. I would say 85% of the people on this site can help you faster and better than sprint's tech guys could ever do.