301 Redirect has removed search rankings

[BizSparkSEO]

As per instructions from a SEO , we did a 301 redirect on our url to a new url (www.domain.com to subdomain xxxx.domain.com). But the problem is we lost all the google rankings that the previous url had gained. How can we rollback this situation. Can we retrieve the rankings of the previous url if we remove 301 permenant move redirection ?

The new url does not figure in the google search for the keyword that use to fetch the previous url at no 3 in the results

Please help ...

[JXTGroup]

Have you setup a change of address in Google Webmaster Tools?

https://support.google.com/webmasters/bin/answer.py?hl=en&answer=83106