It happen to me before when i purchase a camcorder. i send the seller $450, 2months later still nothing. i even called him up, but he never answer the phone. I file a file a complaint to IFCC ( Internet Fraud Complaint Center) 1month later he send the money back to me.
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Additional Resources:
In some situations you may want to contact law enforcement to report suspicious activity. To do so, you can file a complaint with the Internet Fraud Complaint Center or visit the Federal Trade Commission's Web site. You may also want to contact a law enforcement agency in your location or the seller's location.