Garmin Fenix 3 Sapphire / Keep switching off / battery last one day when fully charged

Bought a Garmin Fenix 3 from sportsman’s warehouse a year or so ago.

The watch keep switching of and the battery last for one day when fully changed.

Now takealot claim they can’t help me to send in for repair or replacement.

I’m willing to pay the difference if you test the watch and see what I’m struggling with.

Hope we can resolve this as I’m using Garmin devices for years now.