nationality discrimination in hiring process in private sector for OCI

yathu
so i am a overseas citizen of india ( srilankan nationality )
currently iving in india for past 9 years and also working in hinduja global solution from 1.6 years
last week i attended a job interview and also go the offer letter from the new compnay, after accepting the offer letter i put on my papers in HGS,
today the new company HR send me a mail saying that they have widrawn the offer because i am a non resident of india but in the job profile thy have mention that they will hire people without any nationality discrimination
what can i do here?
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