You should have IMMEDIATELY called the glass company to complain right when it happened, and gotten the vehicle and license info.
Then you should have immediately called the police dept and filed a complaint for vandalism to your vehicle.
Always protect yourself, as nobody will ever step up on their own and do the right thing anymore. YOU have to hold someone responsible for their actions, and it ALWAYS needs to be done ON THE SPOT!
On the upside, if you have full coverage insurance on your vehicle, most insurance waives the deductible on glass.