I have a cc charge off that was sold to a CA. OC reports it as a sold charge off/balance 0. The CA has sent their dunning letters, with the amount due increasing with each letter. They have reported, but was deleted in round one of disputing. I sent a validation letter, they replied with a few copies of statements. I sent them a second validation letter to which they have not responded. The amount prior to the charge off was less than $500, now its almost twice that. If they do not respond to my second validation, should I send a C+D? If I do, what chance do I have of them suing me?