Guess I’ll be getting fired soon

Just trying to leave work and before I could leave for my 4th 12 hour day in a row my manger says they are writing me up for not covering night shifts vacation. I have been staying 3 hours extra every night to make sure it’s covered I just didn’t want to flip my entire schedule as I’m busy on my off hours. Hard work will get you no where if your don’t suck your bosses dick. Fuck you Frank