Letter writing about rude behaviour complaint.

Dear Sir, I am writing this letter to complain about the rude behaviour of the sports coach who takes care of the attendance of teachers in the morning. Firstly, I am Karishma, I have merely joined your school and have started getting acquainted with the rules. The rude incident that took place was in the morning of 11th May, when I was late by five minutes and Mr. Gurpreet Singh who is in charge of marking late in the morning started yelling for no reason. As a response, I still tried to be calm and said you can mark me late. He on the other hand due to the fact of his own insecurities, conveyed to the head of my department about my rude behaviour. This is something that is really disappointing as there is no credibility left when the staff doesnt have the basic moral values. Moreover, after this incident where things are twisted in such a way, the trust factor gets diminished altogether. I would really like you to do the investigation on this case based on humanitarian grounds. If the teachers around are carrying such lack of character, then working around such an environment would really be suffocating. It will be difficult to work in such an atmosphere. I look forward to some fair action against this irrelevant rude behaviour. Yours sincerely, Karishma