UB stopped issuing new trackers around June/July 08, existing loan offers had until i think around end Sept 08 to draw down.
All depends on the wording of your loan offer, if you started on a fixed then it's not a given that the roll was going to be to a tracker and in fact the person on the phone may just have made a mistake as while many loans did roll to tracker they would mainly be ones that started on a tracker and subsequently fixed for a period. Have a look at your loan offer.