...after I sent my signed offer!? I had 2 interviews, in the last one they mention two red flags: my communication skills and my address. I live far from the job, but I was willing to relocate. They also mention that were afraid that my English was not good enough.
Ok, maybe is not discrimination but is an estrange situation. I had several conversations with the supervisor for the position; he liked me very much for the assistant position and asked me to hold an interview with his sup. and HR people. I had two interviews and all the other interviewers can say is that I lived too far; I respond it was not a problem I can relocate. After several phone calls, a second interview in person with the sup. and the HR person the sup called me and talked to me for over an hour, at the end of the conversation he offered me the job. The were supposed to send me the offer by FedEx, then they say the offer had some mistakes and I will receive two offers one correct and one incorrect, I am still have not received anything. Later, they send me the offer by e-mail, I signed and faxed the offer and employment verification application. Now, I received a letter by FedEx saying that they rescind the offer based on concerns about inconsistency between a writing sample

its not discrimination..

your english isnt good enough, go back to college and learn english properly and then apply for other jobs.

i have a business and if their english wasnt good enough i wouldnt employ them if it was involving communication. You need to be clear and prescise..

if it was something where you didnt need to speak to people then yes i might employ you.

but its not discrimination, your havent got the necessary skills and communications that a job would entail.

If you are in the US, a conditional offer of employment is what you describe. An offer letter is not a guarantee of a job, only an offer. Your signature on that letter is not a guarantee that you will take the job, only that you accept the terms of employment - and want the job.

Regarding the distance from work, that can be a red flag if it was something that was brought up several times. Generally, an employer would not be concerned with where you live - but only your ability to preform the job well. Your commute is your problem, not theirs. So if you feel you were denied a job based on where you live, consider talking to the government office in your state that oversees employment law and ask about screening based on distance from the job site and see what they have to say.

Lastly, if they have rescinded an offer based on a writing sample, ask to understand what the inconsistency was. In some cases, you may have the right to the actual results.

yeah so thats not discrimination that being unqualified for the job