Fitbit Fitbit Fitbit charge HR Nationwide

I bought a Fitbit Charge HR after I had Back surgery to help me with my Rehab and keep track of my miles walking.

 It worked great and i was really happy with it.  Then last week I got a notice that it needed to be updated. So i updated it.

 I started having alot of problems the next day.  It would not stayed charged and would not track my miles or steps and would only work half the time when i pushed the button. I emailed fitbit and told them what it was doing. Thet said my tracker is defective and keeps rebooting and it defective. It worked great til they did there updates. They told me that my warrenty was no good and all they could do is give me 25% off a new one.  Why would i want a new one then they do more updates to make me buy another one?  I could see if i did somthing to break it but they broke it by doing there updated when hey have a new model come out. So this is how they sell more trackers by causing the old ones to crash, I really need them to replace it with a working one asap. Thanks