How to retrieve my passport from a friend and settle a loan I took from him?

Hi.

One of my friends has filed a cheque bounce execution case against me for AED 63000. I paid him AED 10,000 already.

He kept my original passport and was not willing to give it back unless I pay him some more money.

Also, his lawyer calls and threatens to get detention order issued against me if I don't pay immediately. Not sure what to do. I am willing to pay.

Paid 10k also but can't pay all together as I was jobless for many months.