Track adjusted -> Tires over?

Hello, just by chance I noticed something quite stupid about my moose: the still quite new tyres are already clearly down on the insides (not 10000 km) on the front (especially VL). To the story: I had new track rods installed at a third-party workshop (but Volvo specialized). Since the steering wheel was slightly crooked after that and I was just at Volvo after that, I had “the wheel angles checked and adjusted” at Volvo. After that, brand new tires came on all 4 wheels (in April 2008). In other words, although the track rods were initially not set correctly (the steering wheel was slightly crooked), the dirty tires would have to be the fault of the Volvo dealer. How do you see this – how would you proceed?