walledgarden xfinity web hijacking

Can anyone give me an idea how to get rid of this nonsense, my modem...you know the one that xfinity never upgrades but wants you to pay rent for until the end of time, died so I replaced it and I also put in a new router so now everytime my wife or I go on the internet we get hijacked by xfinity to some walled garden splash screen where they want me to download some xfi software, I don't have xfi nor do I want xfi.... go to support get nothing, I'm at a loss