I have been working in a company for 17 months ,...

We would like to inform you that Referring to the Qatari labor law regulating the nature of the contractual relationship between the worker and the employer and regarding to vacations:
Article 79:
The worker who has completed one continuous year in the service of the employer shall be entitled to an annual leave with the pay provided for in Article (72) of this law. This leave shall not be less than three weeks for the worker whose service is less than five years and four weeks for the worker whose service is more than five years.
The worker shall entitled to a leave for the fractions of the year in proportion to the period of his service.
Article (80)
The employer shall fix the date- of the annual leave for the worker in accordance with the work requirements and may divide the leave with the consent of the worker provided that the division shall not be into more than two periods.
The employer may on a written application of the worker postpone not more than half of the annual leave to the year following the year of its entitlement.
Article (81)
The worker may not waive his entitlement to the annual leave and any agreement to the contrary shall be void.
The worker shall be entitled to payment in lieu of his annual leave equivalent to his wage for the leave days to which he is entitled if the contract is terminated for any reason before the worker takes his leave.
Thus, any violation by the employer of the law, you can file a complaint at the Ministry of Labor and Social Affairs and explain the matter in detail with an indication of the threat she is exposed to.
If the employer terminate you, it is considered an arbitrary dismal and the employer shall pay compensation to you, which is determined by the court or the Ministry of Labor.