Duplicate site in the Hub (Again)

Hi I have once again a problem with The Hub
https://premium.wpmudev.org/forums/topic/duplicated-site-in-the-hub#post-1180631
There is a duplicated site with www. and without
The one I want to keep is the one with www.
Removing the site last time totally ruined my account and I had to rebuild everything from the ground.
I'm asking your support in order to remove the site without damaging anything else. Please notice that this process did caused me a lot of troubles in the past.
Thanks