@Suzanne13 On the desktop site, click your picture in the upper-right corner, choose Account, choose Notifications, choose Account, go down to Reminders, choose "Edit," then un-check any methods of communication you do not want.
On the phone app, choose Menu at the bottom right, choose Settings, choose Notification settings, choose Account at the top, go down to Reminders, choose "Edit," then un-check any methods of communication you do not want.