You are saying that you have decided not to let him/her into any of your campaigns? Why are you arguing then? You pay them for their posts and say you are out, There is nothing more to this.
I know you don't believe that. There's a lot more to it, as you can see. This campaign is heavily damaged now because of the words and actions of the manager who made a lot of mistakes and broke many rules.
I think you are missing the point here, You participated, posted and received the payment, Now you're out.
Whether the manager agreed to enroll you back or not, That's the manager's decision. You are not owed anything by anyone. One of the rules of every campaign is that the manager has the right to deny or accept anyone they want, You have been denied and they have already paid for your posts made last week.