Attacker Pointing Domain to My Server!

Hello users of Cloudflare!

I need serious help! Someone is pointing their domain towards my server IP which I’m still confused on how they did that. The problem is that whenever I update something on my site their domain updates as well and It’s really sketchy how this third party just randomly took my site. I deleted the index and restarted the httpd I’m using apache on centos 6 to host it. I need help on how to make sure all traffic is only on my domain and my server IP to prevent this sketchy domain from displaying my web page any longer!

This has come up before:

Someone is mirroring your website, you can ban those malicious non-user request ip