For starters, full-stops should be placed at the end of a sentence, never in the middle.
After taking my personal details, including my essay.
How is this a sentence?
Telling me that I was not a suitable candidate for the writing job.
Now - to the issue itself.
1) AA made its decision, and as with any company, is at full liberty to accept or reject an application WITHOUT explanations
2) Since AA could not verify your credentials, they acted responsibly when they rejected you
3) As with other companies, they asked you for a test essay and you submitted it. It is part of your application package and does not mean `they took it' are going to `resell it' or that any proof of your ownership of it is required. Obviously, they did not find it acceptable
4) How is AA `abnormal'?
Now - seeing that you are happy that they rejected you, what is the problem?
Does your rejection constitute proof of AA's dishonesty? To the contrary ...