Error 8111000F - Zero reply from support

For some unknown reason, I’ve been getting Error 8111000F for a week now and can’t access the game. I’ve submitted three support tickets from my official email address. Not a single ticket has been replied to after a week, and I’m starting to suspect that the Russian developers have stolen my account again and want me to create a new one and pay again. I have a history of dozens of payments on this account and I’m not going to create a new one. How should I deal with this? How can I get help and justice when nobody from technical support is responding to the tickets I’ve submitted? Should I file a lawsuit with the European Court of Justice?

I’ve been playing on the same device the whole time. I’ve been using the same computer for about four years. The same operating system. The same phone number and email address where I receive my confirmations. I haven’t changed a thing. I’ve just been abroad for the last 3.5 months, so my IP address has changed. Is that a reason for the unfair and unlawful blocking of my account? So I can’t play Gaijin products whilst travelling around Europe?

How can I resolve this and seek justice?

Account ID: 171220587