Writing a letter to the Bulgarian Embassy

I was excited to visit Bulgaria, I flew all the way to Sofia (Bulgaria), but unfortunately, I was not able to enter it for no reason. I provided everything they wanted me to provide, but no luck (everything was legal). They checked out my baggage and they put me in a very dirty prison (in the airport) under surveillance like a criminal, without food or water, even though I told them that I was very thirsty. The police in my home country didn't understand what happened because, everything was legal on my side, and they told me maybe I was a victim of racism. I contacted the consular officer of Bulgaria in my home country, and she told me that the police officer (a girl) is racist, and I'm not the first case.

I wrote my detailed story in a word document with a simple English and I would like to make it professional and formal and add some quotes from the human rights and the European law.

My goal is to write a professional letter to the embassy of Bulgaria, and I would like to let them know what happened to me, and to emphasis all the human rights violations in order to make sure this will not happen again?

(I'll provide the word document once I hire someone. Thanks.)