What should I do if I have been scamed?
If you believe that you’ve been scammed you should start with contacting the payment service you used (like PayPal), if it was on a “online market site” (like E-bay) contact them. Both Paypal and E-bay, usually, are pretty good when it comes to refunds etc for scams. You could also contact your bank/card issuer, and they might be able to help you.
The next step could be to contact the police, but depending on where you live, and where the scammers are located, there might not be much that they could do about it.