Blizzard has ben preventing this name change thing by noticing that you have deleted your player and made a lvl with the exact same name.
well there is a new way
1) delete your player you want to change the name of
2) make a trial account
3) Make the lvl 1 with the old players name on a diferent computer (they check IP's)
4) wait a day
5) Page a GM on your main accounts and computers alt.
6) GM has no proof that you did a name change scam