If you've been a victim of vandalism or your car was broken into, the first steps you need to take are to document the damage and file a police report. Any personal property you've had stolen from your car will not be covered by your comprehensive policy. You'll need to file a claim under your renters or homeowners insurance policy to receive reimbursement for those items.
What to do in an event your car was broken into or vandalized:
If you've added comprehensive insurance as part of your auto insurance policy, you should be protected from any form of vandalism or car theft. However, comprehensive policies typically come with a deductible that you'll have to pay before the policy kicks in. Because of this deductible, it might make more financial sense to pay for the repairs yourself.