I have a comparable dispute with an old ISP from an old apartment. Their system had me as still receiving services there for many months after I cancelled and moved. Every year they send me a final warning saying it'll go to collections (the fact that it hasn't actually gone to collections more or less tells me I'm right, lol). Every year I'm grateful it's "just" an ISP and not the government because the government would've escalated the fine to a bajillion dollars and issued a bench warrant by now.