The 135 on-demand company I use to work for used that excuse all the time about not calling you. We would bring it up in meetings, and the DO would just look at us and say "All of you get at least 13 days off per quarter". Most of my "DAYS OFF" were sitting at my house #1 on call,watching Judge Judy or something with the pager in my hand waitng to hear the beep to go rescue a sick person somewhere around the world. Yeah; that was some "DAY OFF".