If Marc still has service with Comcast, Comcast will probably try to require Marc to follow the binding arbitration clause in his TOS. On the other hand since Marc was no longer a Comcast customer, when Comcast negligently reported that he made a late payment, after he closed his account, Comcast's mouthpieces might have a hard time enforcing the TOS and forcing binding arbitration in this matter.
There is an opt-out clause in their arbitration agreement that you can do so within so many days of receiving the agreement.
I suspect they have this mechanism to comply with the various franchise agreements of the jurisdictions they deal with. I know in Iowa, a landlord cannot enforce a waiver of jury trial in rental housing (I saw this on housing paperwork years ago).