Repeat question. Previously asked and answered multiple times already. Again, no, an employer does not have any legal obligation to provide the former employee with the work experience letter if it chooses not to do so or if that is the company's policy. The letter confirming employment or work experience is necessary in all PERM and ensuing I-140 petitions where the alien/beneficiary needs to show adequate work experience in increasingly more responsible positions as proof that alien does meet the " minimum" requirements of the job offer in question.
Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
There is no law that requires an employer to provide an experience letter. The best you can do is get your lawyer to draft a detailed explanation of what you did for that employer. It should also explain that since you left that job before one year, no experience letter will be forth coming. Icing on the cake would be see if the personnel or human resources department will conform that you worked there during a specific period of time.
This response is provided for informational purposes only. It is not legal advice and does not create an attorney-client relationship. Questions and answers posted to this forum are public and cannot be kept confidential. Although admitted to the District of Columbia Bar, I currently reside in Texas and I am authorized to practice U.S. immigration law worldwide..