Domain Mapping Help Please

I host with Media Temple : https://www.mediatemple.net/webhosting/dv/features/

I host a few domains here:
http://arnonel.com
http://sharepointmagazine.net
http://spoint.me

ie, those domains point to nameservers :
ns1.mediatemple.net. etc

Now....

spoint.me is wpmu, buddypress
subdomains work, eg: http://arnonel.spoint.me/

What I want is to close down http://arnonel.com (old Wordpress site) and create this site at http://arnonel.spoint.me/

I installed the plugin.
Set custom domain to http://arnonel.com (Original name = http://arnonel.spoint.me/)

Now what happens is http://arnonel.spoint.me/ redirects to http://arnonel.com which doesnt exist (ie, it shows my root site which is http://SharePointMagazine.net)

How do i get it to show the site configured on Spoint.me?