I've only heard my alarm go off once on my 2014 SRI Z but not for a break in. Hopefully this is not a common fault. Unfortunately not good for you. I guess the alarm is tripped when the interior light comes on when the door switch is made. I would check they are working ok. Do you get door open alarms on your dashboard? No doubt Holden will not have experienced this and it might be just luck if you go to a dealer who has.