Defunct FitBit watch was returned as per instructions with promise of being replaced. Mailed Oct '23. Confirmed received at warehouse. Dec 26 '23 chat confirmed - said prior ticket had been closed. The assigned new ticket to follow up and send replacement. Jan 20 '24. Chat confirmed nothing has been done - still show record of returned device to warehouse. Said they would 'keep an eye' on status. Ha. I requested a supervisor be in touch. I do not hold out hope. If they 'right' the matter I will update this post.
UPDATE: March 2024 - Though it took ~ 6 months and a number of online (their website) chat box dialogues, finally a refurbished replacement was sent. Function seems fine. Battery life is several days - Seems short, but perhaps that is normal expectancy. I use mostly the simple functions, heart rate, timer, telling time, text alerts.