They do not need to call my home after 9:00 at night. I find it hard to be nice to the "student" who: wakes my children three nights in a row with a post 9:30 pm phone call and who tells me that because they are a non-profit they can call my home at whatever time they choose.
Furthermore, I gave my annual donation already and don't appreciate repeated phone calls asking for more money.
My policy is that I just NEVER answer the phone if I don't recognize the number on the caller ID. That's the purpose of caller ID. If you call me and don't leave a message or call me and block your number, you will not be talking to me.