HELP! I transferred 0.3 Bitcoin to the wrong address

Hey Guys,

So I wanted to transfer 0.3 tokens to my address. I went to my wallet and followed the instructions. Under the Address name I entered cryptoninja (me) and proceeded with the exchange.

The transaction went through to this person:
https://steemd.com/@cryptoninja

I have no idea who this person is! Can someone help me make contact so I can get my BTC back.

Thanks Guys!

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