You can have any debt collector stop calling you. There is a workforce the phone agents have called cease and desist. You must request that to stop calls, then allow the system to update for 24 hours. If you still receive calls after that you should make  notes because you are now building a court case.

Cease and desist is the number one reason that collections for credit companies get sued over. It's an automatic won or settlement at the least and the courts do not take lightly on the subject.