Returning Xfi Pods

I seem to be having a really hard time getting an accurate answer from Xfinity Comcast Customer Service on returning three Xfi Pods. From three calls to 800-COMCAST, I have gotten 3 different answers on the process of returning them.  Though not one of the 3 agents said, they are not returnable. The first one opened up a ticket but never provided me a ticket number - he said I would get it by email. Since I didn't get any email, called the second time. The lady gave me the ticket and advised I go to a UPS store and return them. I drove to the UPS store and the store owner says w/o a serial number, he can't accept them. The ticket number doesn't help him. Called COMCAST from the UPS store. The agent asked me to start a returns process through www.xfinity.com/returns. Now on the www.xfinity.com/returns website, the pods don't show up as a returnable item in my account. Can someone provide factual advise, not make things on the fly as the three agents have been, on what should I be doing here? The pods are useless and a technician who came to our home to check the internet issues, advised we shouldn't use them. Looks like the left hand doesn't talk to the right at Comcast.