Manager: changes my shifts without notice or me agreeing
Me: you changed my shift and put me to work on 3rd Sunday this month I am not attending this shift
Manager: I didnt change them
Me: sends printscreen of the version history showing his name and date he changed it
Manager: I do not appreciate you sending those screenshots, this is your shift now and try find someone to swap it
Me: yeah sure it is my shift and I will definitely not call in sick on that day…