Once your bitcoin get stolen it is erretrievable. That is why you have to be very careful with your private keys. Even if the block chain technology is keeping tract of every transaction made in bitcoin but it does not keep tract of the identity and personal details of whoever is doing the transactions so there is no way  to get back on whosever is the culprit. So just be careful in doing your bitcoin transactions whom to accept in electronic communication for all you know its just a trap to get you scammed.