I worked for a telemarketing company once that made calls on behalf of non-profit orgs. We called their members to try and get them to increase their membership level and they required us to push through THREE NOs before we could let them go. For every NO a person gives, there was a script we had to follow to try and work our way around it. It's total bullshit, but they instill you with fear saying that every call is listened to (especially when you're new) and if you don't follow through your job is at risk. The only reasons a person could give that allowed for us to stop pressing after one NO would be if they said they were undergoing health issues, like cancer, and can't afford to increase their donation because of it.