Suddenly i am facing with this issue. My problem is, Google has indexed sub domain ( mail.raunakgroup.com ) for my original domain ( www.raunakgroup.com ).

These sub domains were never created by me & are completely unwanted. Everything was almost fine until 2 days back when I figured this issue. I'm afraid that if I do not fix this issue it's going to hurt my rankings soon. How can I remove all the sub domains url's from Google index so that my main domain comes up in search results & how did it get there at the first place.

This is more of a cry for help. Any help would be appreciated.
Thank you!

Hello there,

This is more of an SEO issue. If I were in your position I would look into Google Webmaster Tools help.