I had a simliar problem. Have a look at http://www.vweosclub.com/forums/showthread.php?t=1129. In my case the dealer reset the alarm to its lowest sensitivity level.
That was over a year ago and it was fine for a whole year, though funnliy enough it has gone off a couple of times in the past two months.
That was over a year ago and it was fine for a whole year, though funnliy enough it has gone off a couple of times in the past two months.