I warned about it to people before and when i asked about details they didn't provided anything.
Try to contact bitpay, I am sure they can provide you their information like Name, Bank account etc If they opted for bank transfer, but if they used bitpay to process btc to btc, you are out of luck.
I have contacted Bitpay and they are looking into the matter for me now. I doubt they will provide me with the guys details due to privacy etc, but if they take down his account at least someone else might not get scammed.
I have done a fair bit of investigating and I am 99.9% sure I know who this guy really is, real name, phone number, address etc. I don't want to go into details on how I got this information just yet.
I have contacted him and told him I know who he is and please could he kindly return my bitcoins within 7 days or I will contact the police and / or start legal proceedings against him.