My basic salary is 850. Last month because of this...

We would like to inform you that if you get paid monthly, then you will get your salary monthly and deduct the days that you weren’t working and according to the date of starting the work in the company on 9^th June.

As the Federal Labor Law states:

Article 55

Wages shall be paid in legal tender on a working day, at the place of work, in the official national currency.

Article 56

 Workers employed on yearly or monthly wage basis shall be paid at least once a month; all other workers shall be paid at least once every two weeks.

Article 57

The daily wage of workers employed on piecemeal basis shall be calculated as an equivalent to the average wage received for actual days of work during the six months preceding the termination of his service.

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.