I've gotten several notices recently that I am eligible to upgrade to the xFi Advanced Gateway from the xFi Wireless Gateway. I didn't take advantage of the link when offered so I called to ask how to get the new gateway and was told I would have to pay for it. How do I get the free upgrade?
Pay for it? I seriously doubt that. Since you already have service, you should be able to just swap your current gateway for the XB6 at any Xfinity store.
If you don't have access to a store, we can do that for you here. Let me know and I can have Comcast Support look into this for you.