I am not too well known with Chapter 13, but typically in this instance you're file will have Chapter 13 Protection on it so any exisiting debt will go under this.
CC debt is normally not part of a chapter 13 payment plan. They can claim and if they did, you should be able to log into the trustee website and see if they are listed under the unsecured section of the accounts. They should not be able to sell the debt regardless. If they are not listed as one of the creditors that will get something, I would just put your lawyer on it. This type of thing is why you paid them.