Please, what step do I need to take, my employer...

It should be noted that after reviewing your inquiry and legal scrutiny we would like to inform you that working without a work contract or work visa approved by the Ministry of Human Resources and Emiratization (Ministry of Labor) is illegal because it violates the Immigration and Residence Law.
A person who accepts a visa on a visit is illegally convicted as is the body that employs him, and the possible penalties under the Immigration Act may be imprisonment for a period of "not more than one month".
You will also be unable to file a complaint against the company if it has a violation of the labor law
A passport is a personal document of its owner and is the property of the issuing country. The worker's passport is legally prohibited by law. There are decisions issued by the Ministry of the Interior preventing the sponsor from booking the employee's passport except by a court order. If this happens, we advise you to bring an urgent case before the urgent judge to request that the company be required to hand over the employee's passport. The company does not have the right to hold the passport because it is a criminal by law and is considered an arbitrary act