Sierra Club review: Constant solicitations

We have made more than 20 requests to the Sierra Club through email, regular mail and phone calls to stop soliciting us for donations. Yet they persist. They recently spent $6.25 in postage to send us a huge folder asking for money. And I am sure it is not just us. Once they start, they will not stop. If they are dealing with someone who is elderly or has dementia, I guarantee they will get more donations through their unethical behavior.