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A warm welcome to the community @Aravindh.
Thank you for sharing the inquiry regarding your Charge 4. Sorry to know the inconvenience.
I'd invite you to visit Google Store or the other official retailers like Amazon. Please take a look at this web page.
Best AnswerThe same thing happened to me . I didn't realise there was a replacement Amazon product ( US Amazon - searched for "replacement band for broken fitbit" ). So I glued mine together using Araldite (an epoxy resin in two tubes you mix before using ) . I find this is better than any superglue . Leave it overnight to set and be careful to avoid getting glue near the little spring loaded clip. Apply with a matchstick or similar .