Since Sprint discontinued early upgrades a little while back, they have stopped doing the 14 day early upgrades they used to readily do.
Three weeks ago I added a line on my account and ordered my father a standard flip phone. I was very well aware that my upgrade was not kicking in until 7-1, but the operator who took my order said she could offer me a early upgrade of 6-21. This blew my mind and when I called back to confirm, the second operator literally called me a liar. After I got her operator ID and her manager did not call me back as promised, I called a third time and immediately asked for the account services department. That operator got with her supervisor and they played back my second conversation with the lady who called me a liar and they apologized severely and gave me a one time early upgrade exception for 6-18. But now they are all sold out of the preorder 32gb so I'm going to have to wait until after the release date for them to get more 32gb white units.
Long story short, it took an act of God and a couple of very long complicated calls to get my date pulled in all for nothing. Hopefully they have more soon so I don't have to wait past July for the version I really want.
Good luck, let me know if you get your upgrade date pulled in.