Update:
I just called the automated system for Con Edison and the balance is still there. Technically, I can make a payment to ConEdison directly.
Does that mean that I can then dispute the whole debt because ConEdison was paid? Would this work even if so much time has passed and the account is in collections for a long time already??
In other words, the fact that I paid ConEdison, albeit very late, would be enough to prove that the Collection agency has no right to report me because this is a paid debt?