I used to get repeated collect calls from some prisoner named "Dwayne" although I never accepted the charges because I didn't know him.
I finally called the warden of this prison he had been calling from, explained I didn't know this person, and the calls stopped. I assumed the prisoner thought I knew him and mixed me up with someone else, but I learned the prisoners sometimes try stranger's numbers just to see who will accept their calls and try to scam them somehow if someone is kind enough to accept the collect call to tell them they have a wrong number.