I've been trying to resolve this problem as well. Today, Comcast tried to charge me $1.50/month to add the "Tivo Card" to my account. I told them to forget it, I'm not paying another $1.50/month for something I should be getting already.
I will have to chat again and see if I can find someone that knows hot to fix this. If you know what code was added free of charge, that would be great.