My annual leave request from my company before...

the worker may apply to the employer for the annual leave. The employer has the right to approve granting the employee the required annual leave or to request the division of that leave or to request its delay to the next year at the latest. If the worker violates the employer's instructions, the employer has the right to file a complaint against the worker.
If the employer revokes the approval of the annual leave, the worker must return to work
Here are the texts of the UAE Labor Law regarding your inquiry:
Article 75
A worker shall, for each year of service, be entitled to an annual leave of not less than:
1. Two days a month, where the worker’s period of service is more than six months but less than one year.
2. 30 days a year, where the worker’s period of service is more than one year.
Where a worker's service is terminated, he shall be entitled to annual leave in respect of fractions of the last year.
Article 76:
The employer may fix the date of commencement of annual leave and, if necessary, divide such leave into not more than two periods. However, the leave division provision shall not apply to leaves of child workers.