Sounds like there is something draining the battery abnormally, the dealer should find out why. If not see if they know if this transfer switch is real??
Hyundai Santafe Transit switch
Many companies don't offer it but in our cars, this switch remains even after the car has been prepped and sold. It can be a useful feature for those who find themselves leaving their cars parked for long periods of time while traveling on business and don't want the inconvenience of a dead battery upon return. Follow these steps to remove the transit switch and put your car into quite literally a comatose state.
1. If you are recording your mileage, note the average fuel consumption and speed as they will be cleared once the transit switch is removed.
2. Turn off all electrical loads (i.e. radio, climate control, etc.) and shut the engine off. Wait 30 seconds to one minute before proceeding to step 3.
3. Open the fuse box cover and locate the transit switch. It's a small black plug on the top right of the fuse panel and is larger than your average fuse. Squeeze the release tab and the switch should pop right out. If you make the mistake of doing this at night like I did, be prepared to be plunged into darkness as it controls the dome lights, too.
4. Place the transit switch in a safe place such as the cubby hole in front of the shifter or the top tier of the center console.
5. When returning to your car, install the switch with the release tab on the right side. You will need to reset your clock and if you disabled the 'ECO' light, it will turn back on by default but other than that, all should be normal.
Note: The car can still be started and driven with the switch removed however certain functions will be disabled until the switch is fitted again.