Offer Signed, Notice Given, Offer Gone

A construction professional on a work visa was placed by a recruiter, interviewed in person, and countersigned the offer letter for a sizable raise. They handed in their two weeks. The company then grew hesitant about signing the remaining paperwork; on day thirteen of the notice period, the CEO pulled the offer. On what should have been their last day, they asked their old employer for their job back and were refused. They have a wife dependent on their health insurance.