Blitzed doesn't offer any advice other than fixing the open proxy (which I can't do, since it's not my network ) so I don't think I have any way to remove it from their blacklist. Is there anything CS can do to allow me to connect?
Sorry for the delayed reply. If you're still unable to connect, please send me a private message on this board with the IP address you're connecting from so I can check the blacklists.
An easy way to find your IP address is to visit https://www.whatismyip.com. The "Public IPv4" is your IP address.