Ionic not syncing

[Jafgm21]

My fitbit worked perfectly until one day it stopped syncing...
I tried restarting, forgetting and repairing, and nothing worked...
I tried factory reset and it worked... it asked for a firmware update and in the middle of it it shutted down...

Since then (2 weeks ago) it just won't turn up the logo

I contacted Customer Service and they told me it is out of guarantee coverage. I bought mine on november '17 and they replaced it on june '18 (6 months after purchase because dark lines appeared in the display), now (jan '18 - 6 months after replacement - 1 year 1 month after first purchase) they say the guarantee is from the first purchase.

I thought people at Fitbit were serious...
If your watch has worked for more time, expect it to fail soon and to lose your money (yep, the offered solution is to buy a new one at a discounted price)

Moderator edit: Updated subject for clarity 

[SilviaFitbit]

A warm welcome to the Community @Jafgm21! Thanks again for your patience and working through these troubleshoot with our Customer Service. 

Your feedback and comments are really appreciated, our Support team provides solutions based on the Fitbit Warranty. However, if you would like you can contact them again to review your options once again.

Your understanding is appreciated, I'll be around if you need further assistance.