T-mobile refusing to give me my credits from a promotion I qualified for

Thanks for your post.  I just realized that the same thing happened to me.  I kept thinking they were charging me too much and that my phones should have been paid off a long time ago.  I feel like I have been robbed by t-mobile and am embarrassed that I am just now discovering this.  I do not have time to even try to work this out yet.  Unfortunately, I am busy enough that I have just blindly been paying instead of questioning.  I will try to call t-mobile next week, but may not have enough time.  Meanwhile, my pocket gets picked with each monthly payment.