How to Remove Fake Domain?

I’ve got bad news this morning. My finished review article wouldn’t be paid as the SR support said the content shouldn’t be posted in different urls. They informed the post also occurred in this domain: 

  

http://1sthappyfamily.playsmallgame.com/

I was stunned. The domain is NOT MINE!

I’ve visited the domain and it really looks like my own blog http://www.1sthappyfamily.com

The look and the content are totally similar.

I must remove the post. For the mistake that I didn’t do, my account is suspended temporarily. Sigh.

My first step is to report the bad domain/fake blog to Google DMCA.

Is there other thing that I should do? I need your advice.

Update: Yesterday I also contacted the support of playsmallgame.com. 
This morning, I've tried to visit the domain again. I love the result : SITE NOT FOUND!
I'm so grateful for this quick result. Thanks for good advices.