How is the salary calculated in case of leaving job and on which basis?

I started my career 4 years back in a Dubai mainland company for AED 4500 (3500 basic and AED 1000 allowance as per the labor contract).

After one year, they paid additional AED 500 (Total salary 5000) for housing allowance. On the 2nd year at the time of renewal, they increased my salary AED 2000 (Total salary 7000).

On the third year, they increased AED 3000 on my salary and AED 1000 as vehicle allowance (total salary 10000 + 1000 vehicle allowance). A net of AED 11000 was reflected in my bank every month as salary.

How much is the settlement I can claim as leave salary and end of service benefits as in the labor contract it's still showing the initial joining salary?

They haven't updated the increment I received on each year on the labor system/contract.