I want to resign and file a case against the employer for cutting down salaries

Hi,

I am working as an Engineer in a free zone company in Studio City, Dubai, since 2019 till date. My visa is issued in Abu Dhabi.

From March 2020, they cut down my salary & issued a letter stating that my salary has been cut down from April-20 to Aug-20 by 25%.

But even after August 20, they did not only pay me my initial salary but my salary was cut down a lot more and irregular.

The total pending is about AED 95,000+ to be received to date. Also, the company did not pay for insurance renewal and I was forced to take my own medical insurance for myself & to sponsor my wife's visa & insurance.

I have decided to resign and cancel my visa immediately due to a new job offer.

Is it better to raise the case while on their visa or after changing their visa?

Within how many days should I raise a case after changing my visa and cancelling my work permit?

Kindly provide your opinion on how to proceed.

What are the chances that I get my pending salaries in full and gratuity?