danielweber574 3 posts 19/04/2021 danielweber574 3 posts 19/04/2021, 01:50 19/04/2021, 01:50 If you can't get help through Cash or cash app customer service, you can contact us by calling 1 (800) 969-1940. In addition, you can contact us by mail at the following address: Cash Application, 1455 Market Street Suite 600. San Francisco, CA 94103. Although, as a reminder, no one representing the Cash app will ask you for your phone login code, on social networks, or by any other means, you can visit our website.