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If your inquiry is that your employer is using you, and force you to work overtime, then find the following information:
The UAE Labor Law has defined the weekly working hours for a worker, which is no more than forty-eight hours per week.
Also, if the employer forces you to work overtime, then he / she must pay you overtime-hours. If he / she does not, then, you can file a complaint at the Ministry of Human Resources and Emiratisation against the employer.
Also, making you work on a job description that contradicts what was concluded in the work contract is something which the employee cannot complaint about.
Find below the UAE Labor Law, which is related to your inquiry:
Article 65
The maximum normal working hours for adult workers shall be eight hours in the day, 48 hours in the week. They may be increased to nine hours a day in commercial establishments, hotels, cafeterias, security services and such other businesses as may be added by resolution of the Minister of Labour and Social Affairs. The daily working hours may be reduced by resolution of the Minister of Labour and Social Affairs, in the case of arduous or health-hazardous work. Two during the month of Ramadan shall reduce the normal working hours. The periods spent by a worker in traveling between his home and place of work shall not be included in his working hours.
Article 66
The daily working hours shall be so regulated that no worker shall work for more than five successive hours without breaks - for rest, meals and prayer- amounting in aggregate to not less than one hour. Such breaks shall not be included as part of the working hours. However, in factories and workshops where work is organised in the form of successive day and night shifts, and in processes where work has to continue uninterrupted for technical and economic reasons, the manner in which breaks for rest, meals and prayer are to be granted shall be specified in a resolution by the Minister.
Article 67
Where the work circumstances require a worker to work more than the normal number of hours, any period worked in excess shall be treated as overtime, for which the worker shall receive the wage stipulated for his normal working hours, plus a supplement of at least 25 per cent of that wage.
Article 68
Where the work circumstances require a worker to work overtime between 9 p.m. and 4 a.m. he shall be entitled in respect of such overtime to the wage stipulated for his normal working hours, plus a supplement of at least 50 per cent of that wage.
Article 69
The number of hours of actual overtime shall not exceed two a day, unless such work is essential for preventing a substantial loss or a serious accident, or eliminating or alleviating the impact of the latter.
Article 70
Friday shall be the normal weekly rest day for all workers except the daily-paid. Where a worker has to be put on duty on that day, he shall be compensated with a substitute rest day or be paid his basic wage for his normal hours of work plus a supplement of at least 50 per cent of that wage.