What to do if my friend is harassing me to pay the interest of a loan I took from him?

I had a friend who had loaned me money of AED 3,800 with which I am paying interest for over 2 years now, as my financial state is difficult and promised to pay before the year ends.

I am paying previously 15% and now 10% every month. This month I am paying half of the interest for some reason, and my friend keeps harassing me over a monthly interest.

Please advise if I can report a friend to the police over harassment and be forced to pay. Take note, I always pay interest on time but only this month I am short for money.