No xfinity home subscription

I recently moved into a new home. The past owners left a camera and window/door sensors behind in the home. I called xfinity to make sure that the past owners cancelled there subscription and could no longer view the camera. They told me that the camera was not on and there was no subscription to my address. I also tried to remove the camera but quickly realized it was hardwired and would need a professional to get it out. Well, tonight my son and I walked into our darkened living area and noticed the camera glow red and then quickly turn off. How can this be? Are we being recorded? Is xfinity responsible for removing a former owners equipment? Im very upset by this and has this happened to anyone else?