File a case with OIG-DOL https://www.oig.dol.gov/public/Press%20Releases/OIG-Press-Release-070826.htm That will give visibility to SLB for abuses related to H1B hires and preferences toward South Asian hires.
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https://travel.state.gov/en/report-visa-fraud.html
https://tips.uscis.gov/
https://www.uscis.gov/scams-fraud-misconduct
https://www.usa.gov/report-immigration-violation