These people have called my elderly mother every day for a week.  She could not understand them except to hear something about a debt.  She gave me the phone number and I called them back.  They would not give me a business name, but transferred me to a supervisor (two times).  When I told them I had my mother's power of attorney, my mother had no debt and I wanted their calls stopped, I was told, "So, you want a cease and desist?  OK" and they hung up.  Unscrupleless!