Bitcoin is ;
-Anonymous
-Decentralized
-Irreversible transaction
With this features or qualities alone then you can already tell that there no chance on tracking someone who do held off those coins.
If you get scammed then say goodbye to your coins yet theres no other way to retreive those funds that you had transacted.
If btc transactions can be reverted nor can be traced then Bitcoin wont really be popular as we can see now.
This is all your answers right here- by now you must know it is not possible to trace a BITCOIN transaction.
The guy that you sent you BITCOIN to doesnt have to send them back and sadly you might be out of some BITCOIN here.
Let this be a lesson for you.