I've worked for 5 years as an operator. Every year I get a very low evaluation like 85%, or some years 89%. I asked my manager about it, and he replied "you are working well, next time i will give you 95%." But when the time comes, he gives me 84%. Some other employees get more than me.
I want to send an email to the head-office regarding my evaluation ranking very low. What should I say? I really feel bad that every year I get a very low evaluation even though I work hard.