Connector Cable adaptor missing in 360 box upgrade

(sorry, I've posted this twice as I realised I accidentally put it in the Broadband category instead of TV) Hope someone can help me here as I have just spent 30 minutes trying to get through the automated voice on the phone to speak to an advisor to no avail.

I have just received a new 360 box to replace our old Tivo, but it hasn't come with a connector cable adaptor which is needed to connect the connector cable to the new TV box.  How do I get one?  The chat option isn't working and I can't speak to anyone on the phone so I am now stuck with a TV box that I can't install.