When I reply to a CA, I simply state that" telephone calls to any number , whether personal, business, employer, relative or friend which you have on file pertaining to this "alleged account" is strictly forbidden. This pertains to not only this "alleged debt", but any other "alleged debt" which you have purchased or which you have been assigned as of this letter or at any point in the future.
WE DEMAND THAT ALL FUTURE COMMUNICATION BE IN WRITING AND SENT TO US VIA THE US POSTAL SERVICES. TELEPHONE CALLS ARE STRICTLY FORBIDDEN, AND YOU ARE THEREFORE TO IMMEDIATELY CEASE ALL CALLS !
(How's this for a "BLANKET STATEMENT ") Sure has worked well for me !