If you start a new Roster Calendar, please remember to update your roster in RosterSMS.
Log into WebCIS and manually send a roster to RosterSMS. This will renew your calendar within a few minutes. Ask WebCIS to send the roster to update@rostersms.com
Also ensure that the automatic "Send My Roster Updates" is set as per https://rostersms.com/webcis-roster-update-setup/