@ttonygiu1971 Thats strange because I have a business account and was able to do the upgrade at the apple store but the rep at apple did say that they are not always able to do this. It depends on what they can pull up on your account and if they can...
Apple Store does upgrade corporate accounts but sometimes they have issues with accessing the account details and can't do it. I just picked up an hud iphone 6 at Apple on a corporate account.