My Husband's car was vandalized

My husbands car was vandalized we think when he was at his grandmother's house. He didn't notice any damage until he got inside of his car - the headliner was down on the inside. He didn't think much of it since it's an older car and figured he would deal with it in the morning. When I went out to the car in the morning to take my son to school, I noticed that the entire outside of the car was really scratched up and then when I got inside, I noticed the seats had been torn. Initially, the insurance company processed the claim but recently transferred it to the andquot;special investigations departmentandquot; for investigation! Why would they do this? We did recently add comp and collision to his car because we were having twins and increased all of our insurance. Would this play a part in them transferring it? Why is this happening to my family?