I can't return my equipment! Return site doesn't work!

I've been trying for a month to return this router I got from Xfinity since I moved to an area where it's not available. There are no Xfinity stores for me to drive to so I have to ship it. I tried multiple times calling the Xfinity customer service line to try to get a shipping label and they just keep referring me to the xfinity.com/returns site that doesn't show my device no matter how many times I've tried it. How do I get into direct contact with a real person at Xfinity so I can return this router by getting a shipping label sent to me?