Maybe something as simple as "I don't consider this your home anymore anyway."
To be honest, we have used it as one of her business expenses in our taxes. Be that as it may, what is she going to say? The internet stopped working and I refused to help her? All I said is that I wasn't going to enable her. But I don't want to turn this into a stupid game, or a stupid argument. I said what I had to say, and it was clear.
I considered going to the AT&T store and cancelling her cell phone - it's in my name - but that seems like it would be too much. That would be petty. And she does need to work.
You are not still paying for her cell phone are you?
