Some advice as you compose your letter (for more detail be sure to read Terms of Service). Each of us has strong feelings about certain topics. Strong feelings are okay; expressing those feelings abusively or maliciously, or as a tirade, is not.
We’ve all written heated, intemperate letters and fired them off to the object of our wrath. A better idea is to write the letter, set it aside for a night or a day—then toss it in the wastebasket. Now sit down and start all over, with the passion and purpose intact, but blistering prose removed. Try it.