I don't think the company can take any discipline action on this because all staffs are entitle sick leave. But one thing company can do is when the time of performance review those employees always on MC they will not get a good rating and this gonna affect their bonus and increment. For those who wanna said I am cruel please think twice, if you MC suddenly then the work will pass on to your colleague who did not get extra paid to do your job. If your job do not need others to assist the problem still exist, this will cause delay of work and company loss.

Labour law allow 14 days of sick leave, it doesn't mean we have to take it all.