Criminal case in lieu of default with loan installments

Good Day!

I am seeking help regarding a police case against me.

I have been in custody of Khalifa City police station for 2 days due to the police case against non-payment filed by National Bank of Abu Dhabi (NBAD). I took a car loan from NBAD in January 2016 and was paying monthly the total amount due.

However, during my employment with the previous employer last year I have been in a financial crisis due to eight months without salary, and till now I have not received yet my final settlements from them because the case is still in Labor Department.

I had 2 months' non-payment, however, after getting a new job I am consistently paying the monthly payment leaving the 2 months unpaid, and promised NBAD to pay them once I get my final settlements.

Further, they did not inform me of the legal case, and the car is still under their name. How come they file a case against me?

Moreover, the police case is dated 22nd of July 2018 and my due date of payment is 30th of July.

Please, I am looking forward to your kind advice.