Warm greetings @sarah77,
I am so sorry that this happened to you- it sounds like an all-around nightmare that you did nothing to deserve. I completely understand you desire to find peace and justice with the situation.
Getting a lawyer and going to court can be a huge endeavor within the laws and justice system of one country- when things go international, I’m really sorry to say it, but as someone who constantly deals with international paperwork, even basic things can become borderline impossible- and that’s just for standard immigration situations, I imagine legal cases are on a whole other level
While I usually suggest mundane ways to handle situations when possible, it looks like, from what I can see at least, that magick might be your best bet to find justice in this case.
Some witches might suggest hexes to get back at him, but as that goes against my personal witchy ethics (and it may not go against your witchy ethics, which is fine- do what works best for you and your beliefs!), I would suggest calling on karma to give him what he is due.
While performing a hex makes the caster the executor of punishment and (in my beliefs) puts them at the forefront for any potential retribution or judgement of their own, calling on a higher power to weigh the scales and enact judgement is what I consider to be the same as calling the authorities when you witness a crime- not only is it the safer option that protects oneself, it also gets the case to the attention of those who know more than you do and have the power to bring the most fitting justice.
A higher power, like a deity or the Universe, will likely see and be aware of much more than we are- they will be able to enact the most fitting and most encompassing retribution for this (and any additional) crimes this person committed
Here are a few justice spells you might consider:
Hecate’s Devotional for Justice
A note that Hecate is a Dark Goddess of justice and She has a very special night coming up this week. Wednesday, November 16th is known as the Night of Hekate and would be a particularly good time to work with Her
Return to Sender: Easy Karmic Justice Spell
Whatever you choose to do, I hope you can find both peace and justice. Wishing you all the best, @sarah77!