In my opinion before you report it to FBI Internet Fraud, you can withdraw your bitcoin and try using other marketplace. you can use bitfinex/bitstammp.
Yeah instead reporting this company try to withdraw it in another wallet or exchange site.. if you want to exchange you bitcoin back to fiat or money try this link
https://perfectmoney.is/business-partners.htmlFind a high trusted score so that you are far in scam.. they are also offering moneygram if its available in your country..