The historical first step to deal with this
problem is to do a current drain test on the battery when the car is off and then compare that to specs. Has this been done by your dealer?
Did a tech give you the info, or was it a SA?
By the way, by this time your battery is probably toast and will have to be replaced when you eventually find the problem.
The battery is most likely dead
You might have a light in the glove box, trunk, hood area that is constantly on draining the battery of what life it has left.
Unplug the lights in the trunk, hood and glove boxes.
Or use the movie camera on your cellphone to make
sure the lights go out when you close the doors, etc.
that only works in the frig.