About overtime pay holiday pay that are not being...

Dear Customer,                                
Thanks for joining and trusting us, much appreciated!

We would like to inform you that if the employer fails to pay the overtime wage, in addition to failing to implement some of the terms of the contract, including health insurance, you can file a complaint at the Ministry of Labor in order to obtain your salary in addition to the request to terminate the employment contract as the employer violates its term.
Here is the text of Qatar Labor Law which is related to your inquiry: 
Article (51)
The worker may terminate the service contract before its expiry date if the contract is of a definite duration and without giving reasons for the termination if the contract is of an indefinite duration and retains his full right to obtain the end of service gratuity in the following cases:
1.  If the employer commits a breach of his obligations under the service contract or the provisions of this law.
2.  If the employer or his responsible manager commits a physical assault or immoral act upon the worker or any of his family member.
3.  If the employer or his representative has misled the worker at the time of entering into the service contract as to the terms and conditions of the work.
4.  If continuance with the work endangers the safety and health of the worker provided that the employer is aware of the danger and does not take the necessary steps to remove it.
Article (74)
The workers may be required to work additional hours to the working hours specified in the preceding article provided that the actual working hours per day shall not exceed ten hours unless the work is necessary for the prevention of gross loss or dangerous accident or for the repair or alleviation of the consequences of the said loss or accident.
The employer shall pay to the worker for the additional working hours the rate of not less than the basic wage plus not less than 25% thereof.
The workers who work between 9 pm and 3 am shall be paid the basic wage plus not less than 50% thereof with the exception of the shift workers.

If you have another question, feel free to ask us and we will answer with pleasure.
I hope my answer was helpful, please let me know if you have any follow up questions. If you feel I've answered your question already, please rate my answer from top of the page. Your feedback helps to ensure only the best experts are available to help you.
You can also ask questions of our other specialists in the areas of nutrition, therapists, IT specialists, doctors, and many more.
Kind Regards,