Actually re-reading the first msg it says "...decided instead to join another site of my list that I haven't promoted ever..."
So that means you had signed up to promote the second site, just hadn't actually sent any traffic? If so then Verotel probably don't know/care which clickthrough set the cookie, so long as your account is associated with the site as a reseller then you get the signup.
More guessing of course.
Ask Verotel.
