Someone frauded my bank account? I live in the country, do I file w/ the Sheriff Dept. first or AttyGen ofc?

I've already contacted the credit card companies and in process of filling out their form. I got a fraudulent trust account check deposited into my bank account and my bank could not locate the account so they withdrew the monies unbeknownst to me, of which I own my own company and had already used that trust money to buy equipment to service my jobs. I never thought something like this would happen. Please advise ASAP. Thank you.