Ha ha ha ha ha ha ha ha ha ha ha ha ha ha!!!!!
I really like how you handled the situation, and I think that's good that you're disputing it. Just like a bully, the CA agent backed down when you stood up to her.
Don't bother dealing with them verbally. You won't get anywhere. CAs make their money in huge commissions, so they're going to fight you tooth and nail so they can collect. If you would have agreed to pay the 50 cents on the dollar deal, that CA would become your friend suddenly.

Your best bet is to continue written correspondence only with them. If they don't respond to you, don't worry about it.