I became someone's line manager a few months back who is notoriously difficult to manage. I was convinced it'd be a breeze for me. I like to think I'm fair, consistent and willing to compromise but I think lately my good nature is being taken advantage of by this individual.
The person in question has a minor disability so none of our usual sickness policies apply to them and out of the many jobs their colleagues are responsible for, they only contribute to a small handful.
The job is one in which we need lots of staff doing different shifts as it's customer facing. This week they have on one occasion come in at the wrong time stating it was a mistake and they would be physically unable to come in for their actual shift later on (this left us very short later). A day later I caught them leaving early. They told me they hadn't had their break so they were going now. I should mention they had no intention of letting me know and these breaks are paid. For the first instance, I wasn't around but for the second, I asked if they could let check with a manager in future.
I feel like a conversation after Christmas will be necessary but I'm wanting to approach it both delicately and firmly. Any advice? I've promised myself to switch off a bit over the Christmas break but must say this is playing on my mind.