I have been receiving calls from a local "non-profit" theater company after attending a performance in June 2011. After the first call, I politelty asked them to not call me anymore. Same for the second call, sometime last Spring. They called again in September 2012, and again last night.
The response I received from the phone rep was 1) we are a non-profit so we are exempt from "Do Not Call" regulations, and 2) it takes a year for us to remove your name from our calling list, and it won't be updated again until May 2013.
I went back and forth with the phone rep a bit, and finally asked them to send me a letter in writing indicating they have received my multiple requests to not call and that I would be removed from their list.
I received an apologetic email from someone in charge several minutes later, acknowledging that in September 2012 they did in fact receive my request to not call anymore.
Since they acknowledged their fault in contuning to call me, and also since it seems non-profits can skirt this regulation, what can I do at this point?