Hello.
The only people that can help you with your case it's the volunteers, they can check the information you're providing and if they said that you didn't prove ownership of the account, then you didn't. Regarding the system showing a different place, the account was either registered in this different country, whoever had access to the account requested a location update to that place or yes, you could have used a VPN to register it/update its location, but this is bad because in a verification process an account registered using a VPN doesn't help on verifying you as the account owner or not.
What is worse is that, after the databreach that happened in 2015, most informations about accounts became invalid because, therefore anyone could try to recover any account using the information leaked (although only a small part of the information were leaked). Recovering empty accounts are easier, but if the account still has powers/xats, anything, they would need very solid proof that you're the owner to allow an email change. If they denied, you won't get the decision reversed here. Try to find more evidence that might help prove your ownership of the account, but if you don't, I don't think there's anything else you can do.
I'll remove part of what you said because you revealed personal information. They should only be disclosed within a ticket.
Is there anything else we can help you with?