Caution, T-Mobile refusing to help, online phone upgrade lost in transit

Hoping others learn from my cautionary tale.. I upgraded 3 phones online via the yearly upgrade program and sent them back in the T-Mobile provided packaging and label at a UPS store. Fast forward two weeks and I’m notified that 2 of the 3 phones I mailed back were received. Upon further review, the UPS noted the 3rd phone box was damaged in transit and the box contents were lost. T-Mobile refuses to help and they insured the return package only to $100, which is the most UPS will cover. I am now facing over $1000 out of pocket with no resolution.

Caution to others—-Do not upgrade online, go in person to a store. Or better yet, avoid T-Mobile as they appear completely unwilling to assist loyal customers following their own processes.