I received my annual leave pay from my company and...

There are some sectors that have reduced the salaries of their employees because of Corona Virus , and these sectors have been pre-approved by the Ministry of Human Resources, so you must ensure that the sector you work for has taken approval to reduce wages, knowing that the reduction applies only to non-working employees as for employees who are still workers, a reduction does not apply to them, therefore if the sector did not obtain approval to reduce the wages, you can file a complaint with the Labor Office via the following link