I am going to respond to the title of your thread. You asked if "you should be mad"....................and then you go on to say that you have been promoted to floor supervisor. (congratulations -without pay, by the way).
If you have been promoted, obviously they feel you have some managerial qualities. That said "getting mad" isn't an option.
If the company doesn't have a firm policy about your taking on someone else's shift - then it is up to you to decide what you will and won't do - how much notice you need to have and what is a valid excuse for them to give you.
I don't mean that you need to be arrogant - just that there needs to be some type of order and guidelines for them to follow.
Just think about how this will look on your resume down the road - did you get "mad" or did you take fair action and implement some policies and guidelines for the employees? Sounds like managerial material to me!
Good Luck!
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