I looked up the group, American Institute for Cancer Research. Along with some other charities that subcontract out to telemarketing firms, this group has come under fire for unrelenting calls. I think they're worse than bill collectors. Don't try calling their number they used to contact you (That's the subcontractor.) Call AICR's toll-free number (from their website) to tell them you're on the National DNC Registry 800-843-8114 and to tell them to cease and desist. They told me it would be taken off the list within 48 hours. We'll see.