i had the same problem last week, im at wal-mart parking lot, i tried to stop the alarm i have my FOB and my wife have the other copy we both tried. luckily i manage to stop the alarm without calling for help.
What i did, i use the valet key to open the door and use the FOB to start the engine, the engine started and the alarm just stoped.
so far its been a week now didnt happen again.... it was embarrasing there was an old car beside me in the parking lot with the whole family and a lot of ppl they all look at you like your a wierdo or just trying to show off your new vehicle