All I can say is that you should in no way accept this absolute bs. First, tell yourself that you will get a result no matter what. Ring your local consumer complaints service/ legal help etc. Go into the store armed with a friend/ family and be prepared to kick up a fuss that will have the whole store listening to. Make sure you speak to the absolute top person and tell them that you are a lawyer/ will get a lawyer/ will get consumer affairs involved etc. You have to make it very serious and let them know in no uncertain terms that there is no wayu you arew accepting a faulty item which is ILLEGAL for them to sell to you in the first place. Tell them that it will be a case of a refund or a replacement.
I have had very tough situations and I always get my way when I follow this plan of attack. Afterall you are in the right here.
Finally, I would find out the official length of the bracelet and use this as proof of a fault in yours. use facts rather than feelings.
Good luck!