Hi OttoToot
It is true that a creditor should not be able to collect money from you if the account had been sold to a collection agency.
Also, the collection agency has to show you the legal proof that they have been legally assigned to collect the debt from you. Next time, when Encore places a call to you, request for a debt validation from them.
Send your letter through certified mail with return receipt requested.
Answering to your part of the question, I have heard on this board as well that someone was paying to the creditors although she was getting collection calls. Later, she enquired with the creditors and came to know that the debt was sold to the collection agency. Then, what happened to the money she was paying all throughout. Those were not transferred to her debt account that the creditors were collecting. They were sent to the collection agency authorized to collect from them.
So, it is better to contact the creditors also and inquire about the account while you keep making the payments online. You will be sure of your money going to the right place.
Regards
Roxette