When you requested it to be unlocked were you told you needed to set the device up with Sprint SIM inserted, connected to WiFi, and powered on for 48 hours?
Do you have a Sprint SIM? I am going to provide a link that helps with a successful unlock. If you have a Sprint SIM i can get a unlock ticket submitted today. SOLUTION: Sprint Hints for Successful Unlocks
You will need to get a Sprint SIM for me to process the unlock ticket through. Let us know once you get one, and we can get a ticket done.