How can I get Easter Seals to stop calling our house?

They’re been calling for weeks & weeks. We have Caller ID & I know it’s them, because I called the number back. Last week I just picked up the phone, laid it down on the desk & walked away. They called again. I talked to a gal & told her to take our number off the list. They just called AGAIN! Now I’m mad. I again told her to take our number off. She was still yammering as I hung up. How can I get this stopped? We’re on the Do Not Call Registry, but charities are exempt from this. What can I do??? I am SO sick of them!