If this is the Diabetes Clothesline all you have to do is tell them that you have nothing at this time and they will stop calling...for a while at least. That is what I do as I do donate clothes to them several times a year
got a call from them but they left no message. thats how I ended up on this page. if you have a cell phone, get Mr. Numer free app from Google Play that you can add all the numbers you want blocked and it will either send directly to voice mail or hang up on them.