Dissatisfied customer.

I only put a star because I had to so I could write a review. I bought an item online 2 days ago. A Fitbit bangle. On the day of receiving the item. I call customer service advising I needed to return because it was too big and the battery was not included which is not stated online. They advised that I could return if packaging and item is in sellable condition. I was told the ‘sticker’ on package must be intact! I advise that the top of the box is a little torn because I couldn’t open. Customer service asked me to email photo and I did. Still receiving no reply. Because I know there is a 7 day working policy I went to the store. They couldn’t return or even exchange this item for a smaller size. I am so dissappointed. I can never enjoy the use of this purchase. Really the package/item is sellable. I was then asked if I would like them to gift wrap the item and I can give it to a friend as a gift. Really? I must just throw away hk$551.