kids syncup won't turn on despite charging for hours watch is a few weeks old. thx

Is TMobile going to do anything about it and replace our defective devices with a different model? This is literally the only option they have for a kids' watch. I'm having the same issues with the watch not loading out of the blue. I'm trying to replace it under warranty, and of course they don't have any replacements in stock (not surprising considering how many devices are defective). Does TMobile literally not care? I'm going to switch to Verizon if they don't replace it soon enough