These gutless people who cause you inconvenience should be banned by the phone companies from having a phone number.
Yes, I am on the no call register but still get these calls. Wouldn't mind so much if they at least spoke to you .. but we know why don't we?

I called back number (07) 3613 6243 reached voice mail for a charity company but did not say the name.

I don't want any more calls from this number.