It is your mistake. If you did reside in Germany then you should have provided a document from that country and not from other country. As you have said that they don't accept someone from Netherlands and you know that there are other people who also have the same problem but why did you continue do it when you know they don't accept customers from Netherlands. If you have the day documents from Germany then I recommend you should submit it then you will have a chance to verify your account.
Exactly the point, I sometimes don't seem to understand how some people reason or think, I read the op and know that of course the op has no case against 500 casino because to me, his case is absolutely invalid.
I don't know how someone will expect a casino to accept a kyc verification documents that is from the government of a country on the casinos blacklist,
where is that done? I initially adviced the op to try and obtain a document, like maybe a driver's license and something for the government of Germany which is where he claims to live at the moment, at least with this, he will definitely be able to pass the kyc verification on the casino.
Or he could possible just let go off this casino and look for another casino where his Netherland's passport could be accept for his kyc verification even while he lives in Germany.
Literally everywhere. I have a lot of experience with verifying my account with my Netherlands passport and a German utility bill. Literally everywhere accepted (am talking about 10+ crypto casinos), apart from 500casino.