Calling me to cover your shift or come in early + a bonus "excuse" or reason.

It is so incredibly annoying having my coworkers call multiple times asking if I can come in to take over their shift early. I have had to block a coworker already. But multiple missed calls and a text saying "I'm so sick...I have a headache" and all that shit, I don't care at all. I find it almost worse than the initial disturbance. Whether or not I come in has nothing to do with your predicament when we have managers that are there for emergencies. It just feels so unnecessary because that's not my business and your ailment doesn't move me like that.