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If there is violation in the contract by the worker the employer can refuse grant him certificate of experience, but if there is no violation then you can file a complaint in the labor office
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. So you can file a complaint in front of the labor office in this regard