Get out your policy or renewal notice and write down what you pay, what the policy covers and who drives the car. Then ask two or three other insurers, or a broker, for a quote for exactly the same cover and the same facts. If you are thinking of dropping the part that pays for your own car, ask for one more quote without it, so you can see the real saving; if you owe money on the car or lease it, ask your lender first. Look up what cars like yours are selling for near you. Keep your current policy until a new one has started, give true answers to every question, and keep the cover your state or country requires.
You pick your state and get sent to free legal help and plain legal information from nonprofit legal aid providers there. It also has guides on problems like housing and debt collection.
If someone used your information, you can tell them what happened and get a personal recovery plan with the steps to take. The site also has sample letters and contact details for the credit bureaus.