Volkswagen Golf FSi 2004?

Alarm keeps going off. I have overided the inside ultrasonics/tilt sensor with the switch and it still goes off. I have checked the boot lock switch for water from the rear window wash and still like new. Tonight new battery. I have noticed with the alarm switched on and sitting in the car repeated clicking from around the glovebox then eventually after around 30 minutes off it goes again.Any suggestions I would appreciate.