I don't understand what sort of open contract you are mentioning in the post. Normally all Companies should furnish a copy of the contract agreed by both (Employer and Employee) in the Labor Department to get your RP stamped. One copy each should be with the Employer and Employee. As per the ESB clause of the Employment Contract End of Service benefits should be clearly explained. Please double check with your HR Department what is agreed on this clause and if they are not providing you th ESB you can approach the Labor Dept.