How to claim unpaid salaries and gratuity if the employer ran away?

Good morning attorney,

Trust all is well.

My husband's employer ran away and didn't give him his 3 months salary + 13 years gratuity. The company is closed now and none of the employees got even a single dirham from their employer.

Some of them filed labor cases but till now, nothing happens. My husband is still hoping that he will get it. It's his retirement money. He is really frustrated.

He wants to cancel his visa now as he got a new job but he is afraid that if he does that he will not get his gratuity anymore because he needs to sign that he received everything from his company.

That's what he understood from the explanation of the company PRO. Please help.

Thank you so much and God bless you.