How do you remove/delete a site

How do you remove/delete a site

I called for support last week and was told by "Jerry" that a tech would call me back in 30 minutes.  I'm still waiting for that call back.
 
My problem is that we have some sites that are now obsolete and I have created a new, valid site to move all the assets into.  I have created all the necessary departments under the new site and moved all the assets and users to the new site and associated them with the correct departments within the new site.
 
I can not remove or delete any of the old sites.  I get an error saying that the site is in use by another module.  There is an edit option for the old sites but no delete option.  When I choose a site and then choose Delete from the drop-down, I get the error message that the site is in use by another module.
 
Please advise how to remove old sites.


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