You should promptly contact the local office of your state consumer protection agency. For certain types of fraud, you may want to notify the relevant federal agency or the FBI as well. You can consider reporting the scam to the police and assisting them with filing criminal charges. (However, the decision of whether to pursue charges will be made by a prosecutor rather than you.) Regardless of whether charges are filed or the police think that your case is worthwhile, you can consult an attorney about bringing a civil lawsuit based on the scam. The standard of proof is much lower in civil cases than criminal cases, so you may prevail even if the scammer is not convicted.