Subaru's model year starts in July and ends in June. As do most Japanese car manufacturer's
So they start building the MY03 in 2002 and so on, we usually see the next year model cars in around September.
So your car is a 2002 build year 2003 model. Perfectly normal and the dealership has done nothing wrong

EDIT: What Kym said ^^^^

Also, MY03 is a better engine then MY02, it has AVCS.
Not better looking though

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i