Appaling Fitbit support experience with Core Group

<p>Very disappointed. Had shocking experience regarding my Fitbit charge HR. Purchased in December 2015 from Incredible Connection in South Africa. Still under guarantee. A few weeks ago one of the side buttons fell off. Charge cable no longer fits snugly. Took it back to store. They sent it to the Core group for repair. Was returned to me without being repaired as someone at Core claims the unit has been physically damaged. It has not been damaged at all!!! I love my Fitbit and treat it with TLC! The button literally fell out whilst I was wearing it. Have found many other online references to people having similar complaints regarding the button falling off their Fitbits yet theirs have either been repaired or replaced. What to I do? Can't get hold of anyone at Core to help me, just a call centre. Can someone please help me? Very unhappy. Not what I would've expected from Fitbit</p>