someone else uploaded my file

I got this message:

Curator comments:
Thank you for the upload. This track is already online under a different username: CIDCUSA. We cannot allow duplicates in our database so we reject this track. We are aware that you are the composer of this track so if it's a problem on your end please discuss it with the other user, they are probably your label or distributor company. If you have further questions or problem please contact this email address: support@pond5.com Thank you very much for contributing.

So how do I find this CIDCUSA?

Here:

https://www.pond5.com/artist/cidcusa#1/2064

Thank you very much.