If you does not give consent for salary reduction...

If your inquiry relates to the company deduction of your salary without justification, here are the following information:

The Labor Law did not grant the employer the right to deduct or reduce the salary of the worker. If the employer deducts or reduces the salary, the worker can file a complaint at the Ministry of Human Resources against the employer in order to get his full salary.
If the employer does not provide a document confirming that you have received your full salary or has not provided a justification for the reduction or deduction from the salary, the result of the complaint will be in your favor by requiring the employer to pay your full wage.

Here is the text of the UAE Labor Law concerning your inquiry:

Article 58

Evidence of payment to workers of their due wages, irrespective of their amount or nature, shall not be admissible unless it is in the form of documentary proof, admission or oath.. Any agreement to the contrary shall be null and void, albeit made prior to the date this Law comes into force.

Article (60)

 No amount may be deducted from the wage of the worker for special rights except in the following cases:

 (A) The recovery of advances or amounts paid to the worker in excess of his entitlement, provided that such deductions in this case shall not exceed ten percent of the periodic wage of the worker.

 (B) The premiums that workers must legally pay from their wages, such as social security systems and insurances.

 (C) Worker's contributions to the Provident Fund or advances to the Fund.

 (D) installments of any social project or any other benefits or services provided by the employer and agree by the work Department.

 (E) Fines imposed on the worker for the offenses he commits.

 (F) Any debt collected for the execution of a judicial decision, provided that the deduction for the execution of the judgment shall not exceed one quarter of the remuneration payable to the Worker If there are multiple debts or multiple creditors, the upper limit shall be deemed to be half the wage.