Storm Ready WiFi equipment never worked

I changed from my own modem and router to Xfinity hoping to get better Wi-Fi and received the cable modem, Storm Ready Wi-Fi and two pods. The modem/router worked find however I was never able to get the Storm Ready Wi-Fi to work or the pods. After months of communication through email with support they were not able to help. This was a very long and drawn out process with very long delays between communication. Finally they decided to send a technician to my home to get things working and the tech was not able to get them to work. I took all of the equipment back to Xfinity and they want to continue charging me for the Storm Ready Wi-Fi and not issue a refund for any of the equipment even though it never worked. How do I get this resolved?