A manager (a little higher than my direct manager in the food chain) who I worked with for 1 month ruined an entire appraisal result of mine, and nothing's stopping them from doing it again.
This score leaves me way below my peers, even though my outputs were superior than theirs.
I know for sure that all the feedback I received from rest of my peers was positive.
Is there a way to deal with this, other than leaving the company?