Just a quick guess on my part...  but judging from minerjones' response (what little we are allowed to see) it seems that he never received funds as he's asking if the scammer controlled your wallet as well.

My guess is that the seller pulled a Man-In-The-Middle attack and convinced the buyer to send funds to him while thinking he was sending funds to minerjones.  Again, just a guess since not enough information is provided in the messages, but the first thing I would do is check where you got the Bitcoin address to send the funds to escrow.  My again random quick guess of the situation is that you didn't get the address from minerjones.