Ask Smithy Xtra Captiva pulling to the right

I noticed right away that my 2009 Holden Captiva LX pulled to the right. At 15,000 km I complained to the dealer, but they couldn?t find anything wrong. At 35,000 km the problem was getting worse and both front tyres were starting to show inside wear. Now, at 45,000 km the front tyres are badly worn on the inside. Holden is refusing to acknowledge that the car has an alignment problem, they have told me to go to a dealer and pay for an alignment check. Only then, if their dealer says there's a problem, would they be willing to act. Holden claims that it is normal for the car to steer to the left. The dealer has even suggested that I may have hit a pothole, hence all these problems. It's just ridiculous! What should I do now?