Sales staff lack the necessary s****s

A gentleman from Vodacom arrives at my home and wants to sell fiber to me. I requested that he mail me the information so I can make an informed decision. I give him my email address. He tries several times to write it down but is unable. I take his pen and paper to write it down. His pen does not write at all. How can you send somebody to do door to door sales if they cannot write and spell and has a pen that cannot write