I am very sorry to learn of this situation - but this doesn't sound like a police search.
I am worried that you were victims of a home invasion and you need to contact your local police department to report a crime against you (and your grandmother).
While these kinds of violent impersonations of law enforcement are not common, they do happen, and when they do law enforcement needs to know about them because it is very important to stop these individuals (they are committing very serious crimes and law enforcement will take your report seriously).
Law enforcement does not conduct raids in this manner (doing so would destroy evidence, render any evidence they did obtain inadmissible in court, and eliminate any chance of a conviction if they did find evidence of a crime), and they do not do so without a warrant.
As far as compensation, if law enforcement finds the individuals responsible, you can usually get a criminal restitution order (so if they have assets you can collect against them), and you may qualify for compensation from the state victim restitution fund (the police department or District Attorney's Office will assist you with this).
Your grandmother's home insurance is another source of compensation that can usually help you more quickly.