Sprint may be your best chance...
http://support.sprint.com/doc/sp1464...revPageIndex=3
From that site:
"NOTE:
Repeated entries of an invalid password during a 24-hour period will result in a 20-minute suspension of your username. A suspended username may not be used until the suspension expires, even when submitted with the correct password."
This may be why the Sprint tech told you to wait and why repeated attempts do not work.