Screwed over in a business deal gone south. What would you have done differently against in a situation like this?

MCheetah
I paid a producer I know to make a set of songs for me a few months ago; late March. He lives in another country, Turkey. We had an agreement and everything. I wanted to make a contract because people can be sketchy. He insisted that was not necessary. Because he's in another country, I don't know how I could've enforced it, anyway. I wanted to pay him per song, but with international processing fees and extra charges, it would've been more expensive for both of us that way.

He claimed to be in some kind of financial crisis, but didn't beg me to pay him now; he merely hinted at it. So I agreed to pay him all at once, through PayPal, for the entire set of songs. He gave his word he'd complete the order. Can you guess what happens next?

The first two went along fine. But then after that, he started "taking more gigs" and demos got delayed. He took a vacation for two weeks. Then came back and took another week off. Then his demos got sloppy and half-assed.

Now, just tonight, he's claiming he doesn't have the energy to make demos anymore and regrets the price we agreed on several months ago and tried to tell me I should pay him more because "he's tired" and all this other BS. He gave his word he'd complete the order, since I was helping him out in a bad situation and he needed the money. Now he's demanding $40 extra a song, and refuses to do any correction work on them. Basically "pay me and be happy with whatever half-assed sh*t I give you."

He's not going to finish the work and I've been screwed over. He "claims" he will give me the money back, but we know he's not going to do sh*t. I'm annoyed as hell, because I bypassed by better judgment to help this asshole out. Only to regret it, even if I do have some of the song out of the eight-set order.
Screwed over in a business deal gone south. What would you have done differently against in a situation like this?
TL;DR: I paid a guy in advance to complete 8 songs for me, and now he's quitting 5 songs in and demanding more money if I want him to finish.

What would you have done differently in this bad situation?
Screwed over in a business deal gone south. What would you have done differently against in a situation like this?
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