Hello This belt commissioned in June, I was at first caused a problem of fonctionnement.Après claim is exchanged to me, but after changing the battery, the latter is given to work so I returned the belt we'd quickly sent me this today échange.Or same belt is again down (battery changed), plus display heart rate or completely unreal value (5 months of operation) .What can I do? Can we replace me especially since I did not buy that this belt.