I have something to say to my workplace

Today was supposed to be my day off... but I had to come in for an emergency shift and leave early... or so I thought!? They told me I'd just hand over and finish up, but that's not what we agreed on!? And you should have told me that beforehand!!!! (The reason the person who was supposed to be there left was because there was important work left to do at the office) Well, it's fine though. Since it's going to rain tomorrow and the day after, we can't operate, so I suddenly got the day off and I'm going to an indoor event.