You can easily recover the permanently deleted email in Gmail for that, open your Gmail and then click on the drop-down arrow on the left from your search box at the top of the screen. If any error occurs while doing it then, contact Gmail Helpline UK. Then, it will ask you various questions such as to, or from, subject, keywords as well as date within. Click on the blue search button that appears on the bottom left of the search box then all the deleted emails will be recovered.

http://www.gmail-support.uk/gmail-support.php

Other Sources

http://www.gmail.support-numbers.co.uk/

https://www.ukcontacthelp.co.uk/google-gmail-helpline.php