Hi, I am working with one of India's most reputed groups as an admin executive. In my achievement portfolio, I have successfully set up a new office of 2500 sq ft in just one month, streamlined billing and invoicing for North India, managed admin activities for North India, and handled other miscellaneous tasks. When my reporting manager switched jobs, he was asked to rate me for appraisal. I was confident that I would receive at least a "B" rating, which would make me eligible for performance pay. However, to my surprise, he gave me a "C" rating. I feel really humiliated by this. I am considering typing my resignation letter. Please suggest what I should do in this situation.