What is the legal (Sharia) opinion regarding the responsibility of a company manager whose company is suffering losses, with the owner not responding to improvement proposals, and workers demanding salary increases that the owner rejects?

The employer is not obligated to increase the wages of his workers if known wages have been agreed upon, and he must fulfill the agreed-upon wage until the end of the contract. After that, the workers have the option to leave the work or continue with the old wage. The company manager is not responsible for increasing salaries because he is an agent of the employer and acts within the limits of his agency.