How does this happen with two factor SMS verification? Did you enable your API key?

What is the whole address and transaction id just to trace and see where it went? There is no way to cancel the transaction.

[edit]

Here is the info[1] about the transaction. It seems the transaction way relayed by IP address 71.206.70.250, somewhere in Florida (Comcast customer). It also seems the address[2] only holds your balance for now. You can call Comcast and let them know.

[1]https://blockchain.info/tx/d3f6547f901b45b3c79315e78a1bbcc98...

[2]https://blockchain.info/address/12aW8jPeEc9iQa5ocXCDReJ6Nij4...