Not Entirely New
I remember back when I had Mediacom they started charging a fee if you cancelled part of your service. Like if you had phone and internet and cancelled phone you'd have to pay a fee. But when you cancelled all of your services they'd try sticking you with the fee but never enforced it. When I moved they tried billing me for the disconnection fee. I wrote them a letter telling them to fuck off (but in nicer more civilized language) and I've never heard from them again.