How to claim pending salaries and labor dues then cancel visa to join another job?

Greetings.

I am working in an Abu Dhabi-based company. I have three months pending salaries since Dec 2021. The fourth month is ongoing.

I got a new job and I submitted my resignation by mail on 24-Feb-2022. Now the company says our WBS system is blocked and they can cancel my visa by paying a penalty.

But I have to sign that I received all pending dues, then they will provide my pending dues whenever they received money from a client.

Any chance to join my new company without any problem?

If I go to the labor court, can I get my pending dues immediately?

How much does it cost?

Requesting your kind guidance.