There is a certain debt collector known as Central Portfolio XXXX that is repeatedly calling and harassing my poor old XXXX year old grandmother on the basis of a debt I DO NOT legally owe. I am a resident of XXXX, where the debt should have expired last year, yet they call her at her number in XXXX, where I do not know how they got that number, as I have had no communications with them. What actions should I take to assert my rights and my grandmother 's privacy?