I contacted USCIS may times by info pass also through congress man , all I got was , case is pending due to security check .
You could arrange a consultation with a good immigration attorney to discuss whether filing a mandamus lawsuit to force USCIS to make a decision on your case is appropriate. Mandamus is a legal remedy to force the government to take action on a case. It does not force the government to approve a case. So before moving forward you need to have a detailed discussion with a good immigration lawyer about any potential issues in your case that might lead to a denial, as that is a possible consequence of filing a mandamus.
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