Wrong number etiquette

I'm currently doing some work for the Community Arts Partnership (CAP) which requires me to call former CAP participants and ask them if they want to take a voluntary survey in order to improve the CAP Program. I've been making calls for the last couple of weeks and have literally called hundreds of people. I can't believe how many people interrogate me only to tell me that the person I'm calling for no longer lives there or that I have the wrong number. It blows my mind!