Guzu.com Hesam Meshkat Scam artists Deer Park, New York Nationwide

In October as result of an email and having done business in the past I sent them 2 iPhones, an iPhone 5 for which they offered $100.00 and an iPhone 6 Plus for which they offered $305.00 they claim to pay in three business was days.  After two months went by and numerous emails I get an email selling iPhones wholesale, I send another email and in December to shut me up and after telling me that had someone commit fraud on their accounts they sent me $100.00, when I ask about the other money now they claim they're having glitches with PayPal although they paid me via PayPal. (I won't take their checks as they have bounced). Since theres been no payment I demand to get my iPhone 6plus back since they haven't paid, an employee by the name of Nick assured me I'd be paid and I was on the short list etc, well long story short, after filling complaint with the NY attorney general today I'm forced to file a formal complaint with the FBI Internet Crime Center at the advice of the Florida State Attorney General consumer affairs office. The FBI gave me a case number and email says they will investigate. I've sent this clowns (Guzu) CERTIFIED letters and they refuse to reply. They've also refused to reply to the 50 plus complaints in the BBB of New York that's been filed.