Claiming unpaid dues after salary reduction by the employer

Hi.

My employment contract is unlimited. The company reduced my salary by 40% from Jan 19 and I have not signed the revised agreement.

My employer also did not make any new contract with labour dept. However, I have accepted the revised salary to date. Now, I have resigned from my role.

Do I have any right to ask for my balance salary which is deducted from Jan 19 while making the final settlement?

Kindly advise.