Purchase of Batman Begins

Hi. I had purchased the movie called Batman Begins some years ago and so why is it suddenly not playing and not accessible and why do I get a strange message when I try to view it again?? Is this a technical glitch or has Comcast renewed this particular movie from even those who purchased it? I was told that once things are purchase they can never be removed or become inaccessible. Was that a lie. A store manager in one of the Xfinity stores told me that