How to take back money lent to friends who refuse to return it?

Hi,

My 3 friends borrowed money from me last year.

One is AED 2000, another is AED 2000 and the last one is AED 5000. Now they are working and they blocked my calls and ignore my messages.

I think they don't want to pay me. What will I do to make them pay their debt?

Please help me.