No access to old account which is linked to old version of our blog

Hi all,

I have an issue which is stuck between wp.org and .com…
We had a wp.com site until we migrated to an external server. We now have no access to the old wp.com account.
The problem is this old account is being forwarded to an old version of our blog on a URL which we do not actually own(!)and is the first result in google when one searches for our organisation.
How can I get access to this old account in order to delete the link between the old blog and that URL?

Thanks in advance,

Shane