Well this is just what I was told. I was offered an early upgrade at the end of July. I called to make sure my status was still good, but lo and behold it was gone. They told me that what I was offered had an experation date and I didnt use it. I was never told that I had to use it within a certain time frame. After 3 days and a lot of hassle I was sent to a manager of retentions I was told that retentions had the ability to resest upgrade eligiblity taken away so he had to send it to his boss.
Long story short I got it changed but from my understanding this will be a lot harder to accomplish in the future unless specifically offered a bump in upgrade status. Doubt that helps anyone but maybe it will.