Good morning sir

We would like to inform you that according to the UAE Labor Law, if the work ended legally and the employer agreed on the termination before the end of the contract, then the employer shall grant you an experience certificate. But if the employer refused the termination and the contract is limited then the employer can reject providing the certificate. As below article states:
Article 125
The Employer shall provide the worker, at the latter's request upon expiry of his contract, with an end of service certificate, which shall be free of charge and shall specify the service commencement and end dates, total period of service, the nature of the work he was performing, and his last wage and supplements, if any. The employer shall return any certificates, documents and tools belonging to the worker.