Keep fighting the good fight, but if in the end your account gets sent to collection I wouldn't worry a helluva lot about it. In today's economy, with the millions of people who have genuine credit problems, appealing to the 3 credit agencies and showing them (a)the Sunset contract, and (2) your rescission letter within the legal time period, I think they will amend any damaged credit report for you. I know it shouldn't be necessary, but it's not the world's end.
You may have to cancel a credit card, but that's not a credit killer either. Thousands do it every day in conjunction with fraudulent card use. There's a current thread about this in the Lounge.
Tell the 'financial councilor' that you don't owe anything since you rescinded on(date). Dare their collection agency to take you to court. If they do, you automatically win. Then you go for damages.
Good Luck.
Sorry you are having to go through this.
Jim