How to take the rest of the salary which is not mentioned in the contract

Dear Miss Rajasree,

My salary is AED 15000 according to the offer letter. The labor contract is made only for AED 5000 as salary as requested by the employer. The rest AED 10000 is paid in cash and through a payslip where I make a signature and return back the payslip.

In case of non-payment of cash salary, will I be able to contest in the labor ministry against my employer through a complaint about the nonpayment of cash salaries and succeed?

Regards,