About a year ago I went to a T-mobile store to jump my wife’s apple watch to the new model. The salesperson somehow removed my protection plan without my knowledge and I only discovered yesterday because I went to Apple Store for simple repair and they told me I don't have Apple care on that device.
I called customer service, and they told me because it have been a long time they can not do anything. Because it's a small amount ($12)
monthly, I do have auto pay and the T-mobile bill always have variation. I didn't notice until Apple told me about.
I will try one more time by going back to the store and talk with the manager but if no results probably will be my way back to AT&T because I lost my trust on T-Mobile after this situation.
So be careful when you upgrade any device.
If anyone got into this problem before I will appreciate if you share your thoughts.