Is there a legal determinant within Islamic law that obliges an employer to increase his employee's salary annually, given the employer's injustice and the employee's lack of available options? And is it permissible to deduct a portion of the training for our benefit without the administration's knowledge to ward off the injustice inflicted upon us?

Contracts are binding on the contracting parties unless they violate Islamic law. Therefore, the company is only obligated by what was agreed upon with the worker. The worker has the right to demand a salary increase after the expiry of the contract period, and the company has the right to accept or refuse. If the company refuses, the worker can seek other employment, and the company must pay all his dues in full. The worker is only entitled to what was agreed upon, and he cannot be forced to renew the contract against his will. What he is forced into is not binding on him, and whoever is wronged has the right to appeal to the Sharia (definition) courts.