What if they say “no”?

A different window salesman knocks on our door monthly. We live in a house with single-pane windows, and these salesmen want us to upgrade. I have listened to their pitch several times and said “no” each time. It’s too expensive to switch. I have noticed that no matter how many times I say no, or how many of my neighbors do, the window salesmen continue to knock on doors because someone in the neighborhood bought new windows. We must keep knocking on doors to reach people for Jesus.