Returning job

Left company because of differences then came back couple weeks later because they needed me because they couldn’t find anyone to do the amount of work I was doing,but then after returning for a week they informed me that the vacation time I was going to receive was now going to be taken away and giving back to me in a year,I am trying to not be irritated about it but it just is bothering me,I quit put my two weeks in and followed thru with my end but then decided to come back after they assured me the issues were going to be resolved and changed but then after going back they throw my vacation out. Am I over thinking it or are they trying to prove a point? Thanks!

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