Been with Sprint since 1999 (a shareholder for many of those years). Need to upgrade 4 phones (out of 7 on my plan) . I realize the day of sign up for 2 more years gets a phone. ATT giving away a free phone for a purchased phone. Sprint offered to give me $180 off a new XR. How do I stay a Sprint customer? I added the 7th phone last summer. (new line was turned on to a old phone -), but Sprint is telling me I'm locked in for 2 years? Why? was told it could take seven days to reverse by Customer Care? Why?