I complete my 2year contract then 1 month notice...

We would like to inform you that according to the UAE Labor Law and regarding to the end of service benefits and entitlement, it shall be paid once the work is completed and within ten days at the latest.
Thus, if you are outside the country with the validity of the visa, you can return and follow up the matter by filing a complaint at the Labor Office as it the competent authority if there are problems and labor disputes
If it is not possible, you may refer to the court and get a court ruling obliging the employer to pay you according to the law
As far as passport reservation is concerned, the employer may not reserve the passport with this original, but in the event that the passport is seized with the workplace in the place required by it and if the refusal is made, then you can complain before the nearest police station and you can submit a copy of the complaint to the Ministry of Labor to explain the matter and the violation, but the law permits that the passport be seized at any government department affiliated with the Ministry of Interior with the legal justification for the reservation otherwise, it is considered a legal offense, and this is in contrast to employers in the private sector that prevent them from withholding their workers' passports