I would go to the attorney general in your state. But, at the end of the day, you, and many others, need to start using reputable and professional return preparers. I wish the IRS's proposed regulation of return preparers was upheld, we probably wouldn't be having this discussion.
This is not legal or tax advice or opinions. I am not your lawyer. I do not have the facts necessary to give you an opinion. The answer is a general answer based on the limited facts you have provided. You may contact me direct for legal and/or tax advice.
This does sound like you were the victim of a crime. In addition to contacting the attorney general you should file a police report. You probably aren't this criminal's only victim and with the help of the authorities you may be able to recover some of the money that was stolen from you.
Clint and Philip have given you excellent advice: complain to the police and to the State Attorney General. Unfortunately, I have tried to help taxpayers in this type of situation who, from out of California, used rip-off artists in California, and we got nowhere. So, as the other lawyers advised, the best defense is to use a good quality firm in the first place.