This is trafficking of manpower and is tackled by the Saudi authorities and governments worldwide. Both sponsor and expatriate worker are considered to have violated the law and are subject to penalty. Both parties (employer and employee) are partners in crime. The Saudi who does this shall be fined and his license withdrawn. As for the expatriate worker, he will have to spend time in prison and then be deported to his country with no chance of returning to Saudi Arabia or any of the GCC countries. A way out for the expatriate before this happens is to immediately have the Saudi sponsor transfer his work permit to another legitimate sponsor if he has already spent two years in the country. If he has been here for less than two years, he will not be able to take advantage of this solution. He must find a new employer and have his present sponsor make immediate arrangements to have his work permit transferred as soon as the period of two years pass.
 
 
 
Your understanding of the formation of ESB and its calculations is correct. As for your question of how much must be added to the monthly salary to form LMW, it is stipulated in the last paragraph of Article Two of the Labor Law, which says: "5- what the employer commits himself to provide to the worker for his work by stating it in the work contract or the work organization regulations, is estimated at a maximum of two months’ basic wage per annum, unless otherwise determined to exceed that in the work contract or work organization regulations." So, unless it has been agreed to be more between the two parties in their contract, or in the bylaw of the company, which is considered part and parcel of the labor contract, then the legal answer to your question, as the law says, is actually one-sixth for each of the three items you mentioned. Thus in your case, two-thirds of your monthly salary must be added to form your LMW in your ESB calculation.