The "Change Engine Oil Soon" message should appear on the display panel where the mileage displays....maybe its faulty...
Perform an Engine Oil Change reset as follows:
Engine Off
Turn Key on but do not start engine
Press Accelerator pedal hard to the floor 6 times in quick succession
Start Engine
Message should display "Engine Oil Life Reset"....
If it doesnt, the Oil Life monitoring system may have been disabled or is faulty.
Let us know how you go...