I don't know the insurance coverage in Canada, so, take this with a grain of salt...but, the damage to your car, while to the glass, isn't the result of what would be typically excluded under a glass loss-if you didn't have the coverage.

That would be the same as saying if you got in an accident, and the glass was broken, that they wouldn't pay for the damage to the glass, but would pay for the damage to the car itself.

If you had 'full' coverage, it seems like it would be covered under theft/ vandalism....or what is sometimes called OTC, 'other than collision'. So, I think my advise would be to push the company a little bit...make sure that the claims rep understands that your car was vandalized. If you had limited coverage- liability only, then, it wouldn't be covered....