I am a little but surprised/confused when I read this. Your first message - "the national health card that is an ID in Europe". I am in Europe, and I don't know what a national health card is? But I do have an ID card - and it is not called a national health card. I used OKPay a lot before and I did not have many issues with them. (some payments that were delayed and some orders that failed - but that was always resolved to my entire satisfaction)

I would advise you to check with a lawyer and/or to file a complaint at your local police station. From my experience, they start being quite knowledgeable about cryptocurrencies and internet scams, and of good advice.

I wish you good luck recovering your funds!